documentation/adt-manual/adt-prepare.xml: Notes about installing sysroot

I added a couple of reminders and some links to information about
separately extracting and installing the sysroot filesystem.

(From yocto-docs rev: d340dcb5021fe1dcdaae0830ef8624c0fc54bedf)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/adt-manual/adt-prepare.xml

@@ -229,7 +229,9 @@
             If you want to simply install the cross-toolchain by hand, you can do so by using an existing 
             cross-toolchain tarball.  
             If you use this method to install the cross-toolchain and you still need to install the target 
-            sysroot, you will have to install sysroot separately.
+            sysroot, you will have to extract and install sysroot separately.
+            For information on how to do this, see the 
+            "<link linkend='extracting-the-root-filesystem'>Extracting the Root Filesystem</link>" section.
         </para>
 
         <para>
@@ -315,7 +317,11 @@
                     the cross-toolchain is generated and populated within the build directory.
                     You will notice environment setup files for the cross-toolchain in the 
                     build directory in the <filename>tmp</filename> directory.
-                    Setup script filenames contain the strings <filename>environment-setup</filename>.
+                    Setup script filenames contain the strings <filename>environment-setup</filename>.</para>
+                    <para>Be aware that when you use this method to install the toolchain you still need
+                    to separately extract and install the sysroot filesystem.
+                    For information on how to do this, see the 
+                    "<link linkend='extracting-the-root-filesystem'>Extracting the Root Filesystem</link>" section.
                     </para></listitem>
             </orderedlist>
         </para>