Assign correct variable.

props nendeb55.
fixes #27351. see #14424, [27373].

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git-svn-id: http://core.svn.wordpress.org/trunk@27344 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove duplicate description of WP_List_Table class.

props bravokeyl.
fixes #27346.
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git-svn-id: http://core.svn.wordpress.org/trunk@27345 1a063a9b-81f0-0310-95a4-ce76da25c4cd