Use correct escaping function. props tollmanz. fixes #24300.

git-svn-id: http://core.svn.wordpress.org/trunk@24228 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix typos in phpdoc. props TheLastCicada. fixes #24302.

git-svn-id: http://core.svn.wordpress.org/trunk@24229 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use esc_textarea(), not esc_html(), for escaping textarea content. props johnbillion. fixes #24300.

git-svn-id: http://core.svn.wordpress.org/trunk@24230 1a063a9b-81f0-0310-95a4-ce76da25c4cd