Prevent unnecessary code comments from being output to the front end

[kjellr]

Gutenberg's "Post Comments" block appears to pull its code from the WordPress' theme compat comments.php file here:

​https://github.com/WordPress/wordpress-develop/blob/a0b1f27de6c928fde51bbc7078b32ca9c9d6ed8d/src/wp-includes/theme-compat/comments.php#L30-L75

This includes some code comments that may be useful for developers, but don't actually need to be send to the front end:

I'd suggest we change these from HTML comments to PHP comments, so they aren't visible in the outputted markup.

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Related: ​https://github.com/WordPress/gutenberg/issues/37989

Tested with Gutenberg 12.4
WordPress 5.8.3

[parinpanjari]

-> That effectively kills the line after it which is where "Comments are closed" is output, but without just deleting it completely.

if ( 0 && ! comments_open() ) :

-> simplest way is to find out the following line and delete or comment it.