Fix list formatting in the DocBlock description for `get_post_type_labels()`

[DrewAPicture]

The parser supports converting formatted lists in descriptions into unordered lists for the code reference, but indentations within lists are misread as blockquotes.

[DrewAPicture]

In 35868:

Docs: Remove indentation from a wrapped line in the DocBlock description for get_post_type_labels() to prevent incorrect formatting when parsed.

With the false indentation in place, the parser for the Code Reference incorrectly interprets it as a block quote.

Fixes #35019.

[DrewAPicture]

@coffee2code: Could you please add this to your pre-parse checklist for the 4.4.1/4.5 re-parse? I don't think we need to include this in the point release unless wp-includes/posts.php is touched for another reason.

The formatting has been fixed temporarily in the ​code reference article, and this ticket has been attached.

[coffee2code]

@DrewAPicture: I've made a note to accommodate this before any 4.4.x/4.5 parsing.