Remove a dead variable, `$start`, from `wp_dashboard_recent_comments()`.

See #27882.


Built from https://develop.svn.wordpress.org/trunk@28263


git-svn-id: http://core.svn.wordpress.org/trunk@28091 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove unused variable setting for `$revisions` in `wp_prepare_revisions_for_js()`.

See #27882.


Built from https://develop.svn.wordpress.org/trunk@28264


git-svn-id: http://core.svn.wordpress.org/trunk@28092 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove duplicate variable setting for `$link` in `wp_list_authors()`.

See #27882.


Built from https://develop.svn.wordpress.org/trunk@28265


git-svn-id: http://core.svn.wordpress.org/trunk@28093 1a063a9b-81f0-0310-95a4-ce76da25c4cd