web commit by joey: test edit, replacing a file from underlay

doc/wikilink.mdwn

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+foo!
+
+WikiLinks provide easy linking between pages of the wiki. To create a
+[[WikiLink]], just put the name of the page to link to in double brackets.
+For example "\[[WikiLink]]".
+
+If you ever need to write something like "\[[WikiLink]] without creating a
+wikilink, just prefix it with a "\", like "\\\\[[WikiLink]]".
+
+Note that there are some special [[SubPage/LinkingRules]] that come into
+play when linking between [[SubPage]]s.
+
+WikiLinks can be entered in any case you like, the page they link to is
+always lowercased.
+
+Note that if the file linked to by a WikiLink looks like an image, it will
+be displayed inline on the page.
+
+It's also possible to write a WikiLink that uses something other than the
+page name as the link text. For example "\[[foo|SandBox]]" links to the
+SandBox page, but the link will appear like this: [[foo|SandBox]]