docs for page locking

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+The administrator of a wiki can choose to lock some pages, which allows
+only the admin to edit them using the online interface. This doesn't
+prevent anyone who can commit to the underlying revision control system
+from editing the pages, however.
+
+To lock a page, log into the wiki as whatever user is configured as the
+admin, and in your Preferences page, you'll find a field listing locked
+pages. This is a [[PageSpec]], so you have a fair bit of control over what
+kinds of pages to lock. For example, you could choose to lock all pages
+created before 2006, or all pages that are linked to from the page named
+"locked". More usually though, you'll just list some names of pages to lock.
+
+One handy thing to do if you're using ikiwiki for your blog is to lock 
+"* and !*/Discussion". This prevents others from adding to or modifying
+posts in your blog, while still letting them comment via the Discussion
+pages.