Eliminate use of `extract()` in `wp_xmlrpc_server::blogger_editPost()`.
	
See #22400.


git-svn-id: https://develop.svn.wordpress.org/trunk@28412 602fd350-edb4-49c9-b593-d223f7449a82
Update the inline docs for `add_shortcode()` to eliminate suggestion to use `extract()`.
	
See #22400.


git-svn-id: https://develop.svn.wordpress.org/trunk@28413 602fd350-edb4-49c9-b593-d223f7449a82