Add Existing Documentation for the "Templates" View

Actually there already is a documentation page that describes the
"Templates" view but it was not contained in any ToC xml.

Further Improvements to the documentation itself may be done in a
later commmit.

See: #1794

eclipse.platform.common/bundles/org.eclipse.platform.doc.user/reference/ref-templates-view.htm

@@ -11,9 +11,6 @@
   <h1>Templates view</h1>
   <p>This view allows to work with the templates of the currently active editor. The contents of this view is
   editor-specific and not all editors provide templates.</p>
-  <p>In the example below, we see the Templates view showing the templates for a Java source file:</p>
-  <p><img src="../images/ref-templates-view.png" alt=
-  "Picture of the Templates view showing the templates for the Java editor" border="0"></p>
   <p class="Head">To add the Templates view to the current perspective, click <a class="command-link" href=
   'javascript:executeCommand("org.eclipse.ui.views.showView(org.eclipse.ui.views.showView.viewId=org.eclipse.ui.texteditor.TemplatesView)")'>
   <img src="PLUGINS_ROOT/org.eclipse.help/command_link.svg" alt="command link"> <b>Window &gt; Show View &gt; Other...

eclipse.platform.common/bundles/org.eclipse.platform.doc.user/topics_Concepts.xml

@@ -43,6 +43,7 @@
       <topic label="Tasks view" href="concepts/ctskview.htm" />
       <topic label="Problems view" href="concepts/cprbview.htm" />
       <topic label="Outline view" href="concepts/coutline.htm" />
+      <topic label="Templates view" href="reference/ref-templates-view.htm"></topic>
       <topic label="Properties view" href="concepts/cpropview.htm" />
       <topic label="Search view" href="concepts/csearchview.htm" />
    </topic>

eclipse.platform.common/bundles/org.eclipse.platform.doc.user/topics_Reference.xml

@@ -181,7 +181,8 @@
 		<topic label="Bookmarks view" href="reference/ref-28.htm"></topic>
 		<topic label="Properties view" href="reference/ref-29.htm"></topic>
 		<topic label="Outline view" href="reference/ref-30.htm"></topic>
-        <topic label="Tasks view" href="reference/ref-31.htm"></topic>
+		<topic label="Templates view" href="reference/ref-templates-view.htm"></topic>
+		<topic label="Tasks view" href="reference/ref-31.htm"></topic>
 		<topic label="Problems view" href="reference/ref-31a.htm"></topic>
 		<topic label="Ant editor" href="reference/ref-anteditor.htm">
 			<enablement>