Add a note about return value in case of an expired transient to get_transient() and get_site_transient().

props ruud@joyo.
fixes #28462.
Built from https://develop.svn.wordpress.org/trunk@28676


git-svn-id: http://core.svn.wordpress.org/trunk@28494 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Correct @return value for get_children().

props ghost1227.
fixes #28422.
Built from https://develop.svn.wordpress.org/trunk@28677


git-svn-id: http://core.svn.wordpress.org/trunk@28495 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove closing PHP tags from the rest of index.php files in wp-content, for consistency with wp-content/index.php.

props kraftbj.
fixes #23505.
Built from https://develop.svn.wordpress.org/trunk@28678


git-svn-id: http://core.svn.wordpress.org/trunk@28496 1a063a9b-81f0-0310-95a4-ce76da25c4cd