Add a comment for [27073] as someone will inevitably complain it is tricked by...

Add a comment for [27073] as someone will inevitably complain it is tricked by % in a string. see #25604.

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git-svn-id: https://core.svn.wordpress.org/trunk@26947 1a063a9b-81f0-0310-95a4-ce76da25c4cd