Docs: Remove indentation from a wrapped line in the DocBlock description for...

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.

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git-svn-id: https://core.svn.wordpress.org/trunk@35832 1a063a9b-81f0-0310-95a4-ce76da25c4cd