ref-manual: Enhanced link to the host-user-contaminated test.

The link was just going to the top of the section.  I added an ID tag
to the actual host-user-contaminated test within that insane.bbclass
description.  Now, the user is linked right to that test.

(From yocto-docs rev: b1e5b5a1876e211a8c57bfa727fa9031cfe5e0ac)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/ref-manual/ref-classes.xml

@@ -1551,7 +1551,8 @@
                 <link linkend='var-FILES'><filename>FILES</filename></link>
                 variable values that contain "//", which is invalid.
                 </para></listitem>
-            <listitem><para><emphasis><filename>host-user-contaminated:</filename></emphasis>
+            <listitem><para id='insane-host-user-contaminated'>
+                <emphasis><filename>host-user-contaminated:</filename></emphasis>
                 Checks that no package produced by the recipe contains any
                 files outside of <filename>/home</filename> with a user or
                 group ID that matches the user running BitBake.

documentation/ref-manual/ref-tasks.xml

@@ -279,7 +279,7 @@
                     UID and/or GID of the original file, which is usually not
                     what you want.
                     The
-                    <link linkend='ref-classes-insane'><filename>host-user-contaminated</filename></link>
+                    <link linkend='insane-host-user-contaminated'><filename>host-user-contaminated</filename></link>
                     QA check checks for files that probably have the wrong
                     ownership.
                 </para>