docs(Synchronizers) update incorrect example in synchronizers.md

[avery-tomoverse]

Fixed incorrect example code

Context

The synchronizers page in the docs contains an incorrect example.

Changes & Results

• Changed the example code to reflect the indented behaviour.

Testing

View the change in this PR

Checklist

PR

• My Pull Request title is descriptive, accurate and follows the
  semantic-release format and guidelines.

Code

• My code has been well-documented (function documentation, inline comments,
  etc.)

Public Documentation Updates

• The documentation page has been updated as necessary for any public API
  additions or removals.

Tested Environment

• "OS:
• "Node version:
• "Browser: