Added wiki documentation, a=chris

diff --git a/en-US/pages/documentation.thtml b/en-US/pages/documentation.thtml
index 07ea8d0..8ed66d6 100755
--- a/en-US/pages/documentation.thtml
+++ b/en-US/pages/documentation.thtml
@@ -1967,19 +1967,70 @@ Yioop from a mobile device.
     </pre>
     <p>whose RSS feed looks like:</p>
 <img src='resources/UserRssFeed.png' alt='User Rss Feed'/>
+    <p>As we mentioned above when we described the single group feed
+    page, if we click on the Wiki link at the top we go to the Main
+    wiki page of the group, where we could read that page. If the
+    Main Wiki page (or for that if matter if we go to any wiki page that) does
+    not exist, then we would get like the following:</p>
 <img src='resources/NonexistantPage.png' alt='Screenshot of going to
     location of a non-existant wiki page'/>
+    <p>This page might be slightly different depending on whether the user
+    has write access to the given group. The Syntax link in the above takes
+    one to a page that describes how to write wiki pages. The Edit link
+    referred to in the above looks slightly different and is in a slightly
+    different location depending on whether we are viewing the page with the
+    Activity element collapsed or not. If the Activity element is not collapsed
+    then it appears one of three links within the current activity as:</p>
 <img src='resources/AdminHeading.png' alt='Read Edit Page Headings on Admin
     view'/>
+    <p>On the other hand, if the Activity element is collapsed, then it appear
+    on the navigation bar at the top of the screen as:
+    </p>
 <img src='resources/GroupHeading.png' alt='Read Edit Page Headings on Group
     view'/>
+    <p>Notice besides editing a page there is a link to read the page
+    and a link Pages. The Pages link takes us to a screen where we can see
+    all the pages that have been created for a group:</p>
 <img src='resources/WikiPageList.png' alt='List of Groups Wiki Pages'/>
+    <p>The search bar can be used to search within the titles of wiki pages
+    of this group for a particular page. Suppose now we clicked on
+    Test Page in the above, then we would go to that page initially in Read
+    view:</p>
 <img src='resources/WikiPage.png' alt='Example Viewing a Wiki Page'/>
+    <p>If we have write access, and we click the Edit link for this page,
+    we work see the following edit page form:</p>
 <img src='resources/EditWikiPage.png' alt='Editing a Wiki Page'/>
+    <p>This page is written using Wiki mark-up. So for example, the
+    heading at the top of the page is written as</p>
+    <pre>
+    =Test Page=
+    </pre>
+    <p>in this mark-up. The buttons above the textarea can help you
+    insert the mark-up you need without having to remember it. As was mentioned
+    earlier a complete reference for the mark-up can be found on the Public
+    Syntax page. The Discuss link takes you to a thread in the current group
+    where the contents of the wiki page should be discussed.
+    Underneath the textarea above is a Save button. Every
+    time one clicks the save button a new version of the page is saved,
+    but the old one is not discarded. We can use the Edit Reason field
+    to provide a reason for the changes between versions. When we read
+    a page it is the most recent version that is displayed. However, by
+    clicking the History link above we can see a history of prior version.
+    For example:</p>
 <img src='resources/HistoryPage.png' alt='An example History Page of a Wiki
     Page'/>
+    <p>The Revert links on this history page can be used to change the
+    current wiki page to a prior version. The time link for each version
+    can be clicked to view that prior version without reverting. The First
+    and Second links next to a version can be used to set either the first
+    field or second field at the top of the history page which is labelled
+    Difference: . Clicking the Go button for the Difference form computes
+    the change set between two selected versions of a wiki document. This
+    might look like:</p>
 <img src='resources/DiffPage.png' alt='An example diff page of two versions
     of a Wiki Page'/>
+    <p>
+    This completes the description of group feeds and wiki pages.</p>
     <p><a href="#toc">Return to table of contents</a>.</p>

 <h2 id='crawl-results'>Crawling and Customizing Results</h2>