ref-manual: Updated the list of supported image types.

The list in the IMAGE_TYPES variable description has been
updated to add and remove several image types.

(From yocto-docs rev: d363d4d2dcf1760c5a392b443b52965ca7177984)

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

documentation/ref-manual/ref-variables.xml

@@ -5768,32 +5768,45 @@
                     Specifies the complete list of supported image types
                     by default:
                     <literallayout class='monospaced'>
-     jffs2
-     jffs2.sum
-     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.lz4
      cpio.lzma
+     cpio.xz
+     cramfs
+     elf
+     ext2
+     ext2.bz2
+     ext2.gz
+     ext2.lzma
+     ext3
+     ext3.gz
+     ext4
+     ext4.gz
+     hdddirect
+     hddimg
+     iso
+     jffs2
+     jffs2.sum
+     multiubi
+     qcow2
+     squashfs
+     squashfs-lzo
+     squashfs-xz
+     tar
+     tar.bz2
+     tar.gz
+     tar.lz4
+     tar.xz
+     ubi
+     ubifs
      vdi
      vmdk
-     elf
+     wic
+     wic.bz2
+     wic.gz
+     wic.lzma
                     </literallayout>
                 </para>