Correct references to post-template.php in the inline docs.

props softmodeling.
fixes #29188.
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git-svn-id: http://core.svn.wordpress.org/trunk@29247 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Clearer visual differentiation between panels and sections in the customizer. props celloexpressions. see #28979.

Built from https://develop.svn.wordpress.org/trunk@29470


git-svn-id: http://core.svn.wordpress.org/trunk@29248 1a063a9b-81f0-0310-95a4-ce76da25c4cd