This fixes two WPCS warnings:
* `Variable "$comment_post_ID" is not in valid snake_case format`
* `Variable "$comment_author_IP" is not in valid snake_case format`
While matching the database fields of the same name, these variables did not follow the WordPress coding standards, and are now renamed to address that.
Note: The name change only affects internal variables and parameters for a few actions receiving a comment post ID:
* `edit_comment`
* `comment_id_not_found`
* `comment_closed`
* `comment_on_trash`
* `comment_on_draft`
* `comment_on_password_protected`
* `pre_comment_on_post`
The change does not affect parameters for functions receiving an array of comment data:
* `wp_insert_comment()`
* `wp_new_comment()`
* `wp_update_comment()`
* `wp_handle_comment_submission()`
The associated array keys still match the database fields: `comment_post_ID` and `comment_author_IP`.
Follow-up to [1706], [2894], [8720], [28427], [28437], [28457], [34799], [53720],
See #55647, #56244.
Built from https://develop.svn.wordpress.org/trunk@53723
git-svn-id: http://core.svn.wordpress.org/trunk@53282 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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