Add back a section on Target Patterns in "user-manual.html"

This makes the section more discoverable, and this fixes links that referred
to the old page.

RELNOTES: None.
PiperOrigin-RevId: 220192961
diff --git a/site/_layouts/documentation.html b/site/_layouts/documentation.html
index 77410c6..b3413ab 100644
--- a/site/_layouts/documentation.html
+++ b/site/_layouts/documentation.html
@@ -69,7 +69,7 @@
               </li>
 
               <li><a href="/versions/{{ site.version }}/build-ref.html">Bazel Concepts</a></li>
-              <li><a href="/versions/{{ site.version }}/guide.html">User Manual</a></li>
+              <li><a href="/versions/{{ site.version }}/guide.html">User's Guide</a></li>
               <li><a href="/versions/{{ site.version }}/external.html">External Dependencies</a></li>
 
               <li>