Fixed typos to prevent Doxigen parsing failures

[bmribler]

• Added missing html tags
• When \c is used inside , Doxygen did not parse correctly, causing a mismatched error. Replaced \c with <tt></tt>.

[ellipsis-dev]

There appears to be a typo with the Doxygen command on this line. The original text used \c ENUM: while the change now uses \TText{ENUM:}. Please verify if \TText is the intended command or if it should remain \c (or another valid Doxygen macro), as the commit title suggests this change was to fix typos.

Suggested change

	* <b>Callback struct and \TText{ENUM:}</b>
	* <b>Callback struct and \c ENUM:</b>

[bmribler]

No, it is not a typo. The original source had:
Callback struct and \c ENUM:
Doxygen was converting \c ENUM: into <computeroutput>ENUM:</computeroutput>
This created mismatched/improperly nested XML tags: ...<computeroutput>ENUM:</bold></computeroutput>
The XML parser failed on this, preventing the entire file from being indexed.
Using <tt> instead of \c inside HTML <b> tags avoids the nesting issue.

The problem was mixing HTML tags (<b>) with Doxygen commands (\c). The fix ensures proper XML nesting.