web commit by JeremyReed: fix mispelled word

doc/wikilink.mdwn

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+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]]".
+
+There are some special [[SubPage/LinkingRules]] that come into play when
+linking between [[SubPages|SubPage]].
+
+Also, if the file linked to by a WikiLink looks like an image, it will
+be displayed inline on the page.
+
+WikiLinks are matched with page names in a case-insensitive manner, so you
+don't need to worry about getting the case the same, and can capitalise
+links at the start of a sentence, and so on.
+
+It's also possible to write a WikiLink that uses something other than the
+page name as the link text. For example "\[[foo_bar|SandBox]]" links to the
+SandBox page, but the link will appear like this: [[foo_bar|SandBox]]