ref-manual: Edits to IMAGE_FSTYPES and IMAGE_TYPES variables.

(From yocto-docs rev: f852fff164e926f3b821c59f293904125cbb17bd)

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

documentation/ref-manual/ref-variables.xml

@@ -1729,38 +1729,9 @@ Core layer for images cannot be removed
                 <para>
                     Specifes the format of the root filesystem create by
                     the OpenEmbedded build system.
-                    Valid types include but are not limited to the following:
-                    <literallayout class='monospaced'>
-     jffs2
-     sum.jffs2
-     cramfs
-     ext2
-     ext2.gz
-     ext2.bz2
-     ext3
-     ext3.gz
-     ext2.lzma
-     btrfs
-     live
-     squashfs
-     squashfs-xz
-     ubi
-     ubifs
-     tar
-     tar.gz
-     tar.bz2
-     tar.xz
-     cpio
-     cpio.gz
-     cpio.xz
-     cpio.lzma
-     vmdk
-     elf
-                    </literallayout>
-                    For more information on how these types of images, see
-                    <filename>meta/classes/image_types*.bbclass</filename>
-                    in the
-                    <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>.
+                    Available formats are a subset of the
+                    supported images listed in
+                    <link linkend='var-IMAGE_TYPES'><filename>IMAGE_TYPES</filename></link>.
                 </para>
             </glossdef>
         </glossentry>
@@ -1951,7 +1922,7 @@ Core layer for images cannot be removed
                 <para>
                     Specifes the type of image created by the OpenEmbedded
                     build system.
-                    Valid types include but are not limited to the following:
+                    Here are the supported image types:
                     <literallayout class='monospaced'>
      jffs2
      sum.jffs2