Sync vi/ex and editors documentation with current reality.

 - Most suggested documentation (except for vi(1) man page) is available in
   misc.tgz installation set, adjust the suggestion accordingly
 - Instead of pointing the reader to src directly point her to documentation in
   /usr/share/doc and add the *.{ps.gz,txt} paths in the list
 - `Vi tutorial' is no longer available, adjust that in the list and suggests
   `An Introduction to Display Editing with Vi' as a starting point for vi(1).
 - `Vi Command & Function Reference' is no longer available, suggests
   `Ex/Vi Quick Reference' as a useful reference instead.

Should address PR misc/53091 by Ray.

Index: chap-edit.xml
===================================================================
RCS file: /cvsroot/htdocs/docs/guide/en/chap-edit.xml,v
retrieving revision 1.1
diff -u -p -r1.1 chap-edit.xml
--- chap-edit.xml	9 Jun 2007 14:30:52 -0000	1.1
+++ chap-edit.xml	12 Mar 2018 09:21:08 -0000
@@ -400,52 +400,58 @@ set cedit=^[</programlisting>
     <sect2 id="chap-edit-configuring-vi-doc">
       <title>Documentation</title>
 
-      <para>The source <emphasis>tarball</emphasis>
-        (<filename>src.tgz</filename>) contains a lot of useful
-        documentation on (n)vi and ex, in the
-        <filename>/usr/src/usr.bin/vi/docs</filename> directory.
+      <para>The misc <emphasis>installation set</emphasis>
+        (<filename>misc.tgz</filename>) contains a lot of useful
+        documentation on (n)vi and ex, and when installed it is available in
+        <filename>/usr/share/doc</filename> directory.
         For example:</para>
 
       <itemizedlist>
         <listitem>
-          <para>Edit: A tutorial</para>
+          <para>Edit: A tutorial -
+          <filename>/usr/share/doc/usd/edit/edit.{ps.gz,txt}</filename>
+          </para>
         </listitem>
 
         <listitem>
-          <para>Ex Reference Manual</para>
+          <para>Ex Reference Manual -
+          <filename>/usr/share/doc/reference/ref1/ex/reference.{ps.gz,txt}</filename>
+          </para>
         </listitem>
 
         <listitem>
-          <para>Vi man page</para>
+          <para>Vi man page -
+          &man.vi.1;
+          </para>
         </listitem>
 
         <listitem>
           <para>An Introduction to Display Editing with Vi by
-            William Joy and Mark Horton</para>
+            William Joy and Mark Horton -
+          <filename>/usr/share/doc/usd/vi/vitut.{ps.gz,txt}</filename>
+          </para>
         </listitem>
 
         <listitem>
-          <para>Ex/Vi Reference Manual by Keith Bostic</para>
+          <para>Vi/Ex Reference Manual by Keith Bostic -
+          <filename>/usr/share/doc/reference/ref1/vi/vi.{ps.gz,txt}</filename>
+          </para>
         </listitem>
 
         <listitem>
-          <para>Vi Command &amp; Function Reference</para>
+          <para>Ex/Vi Quick Reference -
+          <filename>/usr/share/doc/usd/vi/summary.{ps.gz,txt}</filename>
+          </para>
         </listitem>
 
-        <listitem>
-          <para>Vi tutorial (beginner and advanced)</para>
-        </listitem>
       </itemizedlist>
 
-      <para>If you have never used vi, the <quote>Vi tutorial</quote> is a good
-        starting point.  It is meant to be read using vi and it gradually
-        introduces the reader to all the vi commands, which can be tested
-        while reading.
+      <para>If you have never used vi,
 	<citetitle>An Introduction to Display Editing with Vi</citetitle> by
-	William Joy and Mark Horton is also a very good starting point.</para>
+	William Joy and Mark Horton is a very good starting point.</para>
 
       <para>If you want to learn more about vi and the nvi extensions you
-	should read the <citetitle>Ex/Vi Reference Manual</citetitle>
+	should read the <citetitle>Vi/Ex Reference Manual</citetitle>
 	by Keith Bostic which documents all the editor's commands
 	and options.</para>
     </sect2>