Docs: Improve document and parameters in render_block_core_* function

[dilipbheda]

While reviewing the core-registered block callback functions in wp-includes/blocks/, I noticed that some inline documentation references undeclared variables. These should be corrected for clarity and accuracy.

Additionally, in the render_block_core_latest_comments function, I updated the $attributes = array() default to just $attributes since the callback already passes the value into the function. I compared this with other blocks callbacks and removed the unnecessary default assignment to maintain consistency.

[audrasjb]

Hello, the files located in wp-includes/blocks can not be updated directly on core, they must be updated upstream in Gutenberg GitHub repository.

[dilipbheda]

@audrasjb Thank you for your response. I've submitted [pull request]​https://github.com/WordPress/gutenberg/pull/69856 to the GitHub repository.

@dilipbheda These files are automatically synced from Gutenberg to core, so they cannot be modified in core.

Let's close this PR and move forward with the Gutenberg PR: ​https://github.com/WordPress/gutenberg/pull/69856

[wildworks]

This issue has been fixed on Gutenberg: ​https://github.com/WordPress/gutenberg/pull/69856