Found using php maintenance/findHooks.php.
Change-Id: I6977cd5c57566025a63be1c5042d5d64eed44676
'SearchableNamespaces': An option to modify which namespaces are searchable.
&$arr : Array of namespaces ($nsId => $name) which will be used.
+'SeleniumSettings': Undocumented.
+
'SetupAfterCache': Called in Setup.php, after cache objects are set
'ShowMissingArticle': Called when generating the output for a non-existent page
&$text: Link text.
&$result: Complete assoc. array if you want to return true.
+'SkinTemplateTabs': Undocumented.
+
'SkinTemplateToolboxEnd': Called by SkinTemplate skins after toolbox links have
been rendered (useful for adding more)
$sk: The QuickTemplate based skin template running the hook.