update troubleshooting guide with CRD links and improved formatting

[sachin21212121]

This PR updates the KubeEdge troubleshooting guide to improve readability and usability. Changes include:

• Replacing raw GitHub links with links to the GitHub file pages for CRDs and release packages.
• Updating examples to KubeEdge v1.21.0.
• Improved Markdown formatting: headings, bold text for key actions, inline code for commands and filenames.
• Added clear instructions for troubleshooting Pending/Terminating pods, verifying node health, and locating CloudCore/EdgeCore and pod logs.
• Ensured consistent spacing, code blocks, and link formatting throughout the document.

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[gemini-code-assist]

Summary of Changes

Hello @sachin21212121, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on a comprehensive update to the KubeEdge troubleshooting guide. The primary goal is to make the documentation more accessible, accurate, and user-friendly by refreshing content, updating examples to the latest KubeEdge version, and refining the overall presentation. These changes aim to streamline the troubleshooting process for users encountering common issues.

Highlights

• Documentation Update: The KubeEdge troubleshooting guide has been significantly updated to improve readability and usability for developers.
• Link and Version Updates: Raw GitHub links have been replaced with direct links to file pages for CRDs and release packages, and all examples are updated to KubeEdge v1.21.0.
• Improved Formatting: Markdown formatting has been enhanced with clearer headings, bold text for key actions, inline code for commands, and consistent spacing and code blocks.
• Expanded Troubleshooting Steps: New, clear instructions have been added for troubleshooting Pending/Terminating pods, verifying node health, and locating CloudCore/EdgeCore and pod logs.

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[gemini-code-assist]

Code Review

This pull request significantly improves the troubleshooting guide by updating the examples to a more recent version, improving the structure, and making the instructions clearer. The changes make the document much more user-friendly. I've provided a few suggestions to further enhance formatting consistency and address some minor issues. The most critical point is to restore the frontmatter, which is essential for the documentation site. Other suggestions focus on standardizing headings and restructuring some sections for better readability.

[gemini-code-assist]

The frontmatter for the page title and sidebar position has been removed. This metadata is necessary for the documentation site generator (Docusaurus) to correctly display the page title and position it in the navigation sidebar. Please restore it. I've also corrected a typo in the original title from TroubleShooting to Troubleshooting and simplified the main heading.

Suggested change

	This page contains a few commonly occurring questions.
	# **Troubleshooting**
	---
	title: Troubleshooting
	sidebar_position: 7
	---
	# Troubleshooting

[gemini-code-assist]

Headings in this document are formatted inconsistently. Some use redundant bolding (## **...**), while others use bolded text (**...**) instead of a proper heading tag (like on lines 48, 99, 111, and 130). For consistency, accessibility, and correct document structure, all main section titles should be level 2 headings like ## Title.

Suggested change

	## **keadm init failed to download release**
	## keadm init failed to download release

[gemini-code-assist]

There's a minor formatting issue here. The double asterisks for bolding are misplaced, which can affect rendering. There should be a space between 'the' and the bolded text.

Suggested change

	For v1.21, use the** v1beta1 CRDs** available under `build/crds`:
	For v1.21, use the **v1beta1 CRDs** available under `build/crds`:

[gemini-code-assist]

The troubleshooting steps in this section are structured inconsistently, mixing list items with simple bolded text, which makes the flow difficult to follow. Refactoring this into a clear, numbered list of steps would greatly improve readability and structure. This change also fixes an issue where an explanatory note was incorrectly placed inside a code block.

If your pods remain in a Pending or Terminating state, try the following troubleshooting steps:

1.  **Check node health**
    Run `kubectl get nodes` and ensure all nodes are in a `Ready` state.

2.  **Describe the pod**
    Run `kubectl describe pod <your-pod>` to get details about scheduling and other events.

3.  **Inspect EdgeCore logs**
    - **If using systemd**:
      ```bash
      journalctl --unit edgecore.service -f
      ```
    - **If started manually**:
      Check the log file specified at startup or stdout.

4.  **Verify architecture compatibility**
    Ensure the container image architecture matches your edge node's architecture. For example, use `arm64v8/nginx` for a Raspberry Pi 4 (arm64) instead of the default `nginx` image.

5.  **Check `podSandboxImage` in `edgecore.yaml`**
    Confirm that `podSandboxImage` points to a valid and compatible image for your node's architecture.

6.  **Manually run the container**
    Attempt to run the container image manually on the edge node to isolate potential runtime issues:
    ```bash
    docker run <your-container-image>
    ```

7.  **Check disk space**
    Insufficient disk space can prevent new images from being pulled. Free up space if necessary.

[gemini-code-assist]

The list explaining how to find pod logs has some formatting issues with nested lists, making it slightly confusing. I've restructured it for better clarity.

Suggested change

	To access pod logs:
	- Connect to the edge node.
	- Use one of the following methods:
	1) Check the log files under /var/log/pods.
	2) Use Docker to view container logs:
	```bash
	docker logs <container-id>
	```
	Alternatively, enable the kubectl logs feature:
	See [Enable kubectl logs/exec to debug pods on the edge](https://kubeedge.io/docs/advanced/debug/).
	To access pod logs, first connect to the edge node, then use one of the following methods:
	1. **Check log files directly**:
	The logs are located in the `/var/log/pods` directory.
	2. **Use Docker to view container logs**:
	```bash
	docker logs <container-id>
	```
	Alternatively, you can enable the `kubectl logs` feature to access logs from the cloud side. See [Enable kubectl logs/exec to debug pods on the edge](https://kubeedge.io/docs/advanced/debug/).

[gemini-code-assist]

There is a missing space between the word 'the' and the markdown link. This will prevent the link from rendering correctly.

Suggested change

	- Official release artifacts and checksums are on the[KubeEdge v1.21.0 release page](https://github.com/kubeedge/kubeedge/releases/tag/v1.21.0).
	- Official release artifacts and checksums are on the [KubeEdge v1.21.0 release page](https://github.com/kubeedge/kubeedge/releases/tag/v1.21.0).

[Shelley-BaoYue]

Please fix DCO with git commit -s

[Shelley-BaoYue]

You can preview the final document effect through this link https://deploy-preview-726--kubeedge.netlify.app/docs/developer/troubleshooting . Please refer to the effect to fix format.

[fujitatomoya]

Improved Markdown formatting: headings, bold text for key actions, inline code for commands and filenames.

i do not think this is the main objective of this repository.
this PR generates some broken changes for documentation site.

@sachin21212121 are you still working on this?