make_clickable: When cleaning up accidental links within links, account for the tag being split by newlines.

props dd32.
fixes #19028.

Built from https://develop.svn.wordpress.org/trunk@26974


git-svn-id: http://core.svn.wordpress.org/trunk@26853 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use the_title_attribute() in feed_links_extra(), rather than get_the_title().

props c3mdigital.
fixes #15046.

Built from https://develop.svn.wordpress.org/trunk@26975


git-svn-id: http://core.svn.wordpress.org/trunk@26854 1a063a9b-81f0-0310-95a4-ce76da25c4cd