[media] Add multi-planar API documentation

Add DocBook documentation for the new multi-planar API extensions to the
Video for Linux 2 API DocBook.

Signed-off-by: Pawel Osciak <pawel@osciak.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/Documentation/DocBook/media-entities.tmpl b/Documentation/DocBook/media-entities.tmpl
index be34dcb..74923d7 100644
--- a/Documentation/DocBook/media-entities.tmpl
+++ b/Documentation/DocBook/media-entities.tmpl
@@ -129,6 +129,7 @@
 <!ENTITY v4l2-audioout "struct&nbsp;<link linkend='v4l2-audioout'>v4l2_audioout</link>">
 <!ENTITY v4l2-bt-timings "struct&nbsp;<link linkend='v4l2-bt-timings'>v4l2_bt_timings</link>">
 <!ENTITY v4l2-buffer "struct&nbsp;<link linkend='v4l2-buffer'>v4l2_buffer</link>">
+<!ENTITY v4l2-plane "struct&nbsp;<link linkend='v4l2-plane'>v4l2_plane</link>">
 <!ENTITY v4l2-capability "struct&nbsp;<link linkend='v4l2-capability'>v4l2_capability</link>">
 <!ENTITY v4l2-captureparm "struct&nbsp;<link linkend='v4l2-captureparm'>v4l2_captureparm</link>">
 <!ENTITY v4l2-clip "struct&nbsp;<link linkend='v4l2-clip'>v4l2_clip</link>">
@@ -167,6 +168,8 @@
 <!ENTITY v4l2-output "struct&nbsp;<link linkend='v4l2-output'>v4l2_output</link>">
 <!ENTITY v4l2-outputparm "struct&nbsp;<link linkend='v4l2-outputparm'>v4l2_outputparm</link>">
 <!ENTITY v4l2-pix-format "struct&nbsp;<link linkend='v4l2-pix-format'>v4l2_pix_format</link>">
+<!ENTITY v4l2-pix-format-mplane "struct&nbsp;<link linkend='v4l2-pix-format-mplane'>v4l2_pix_format_mplane</link>">
+<!ENTITY v4l2-plane-pix-format "struct&nbsp;<link linkend='v4l2-plane-pix-format'>v4l2_plane_pix_format</link>">
 <!ENTITY v4l2-queryctrl "struct&nbsp;<link linkend='v4l2-queryctrl'>v4l2_queryctrl</link>">
 <!ENTITY v4l2-querymenu "struct&nbsp;<link linkend='v4l2-querymenu'>v4l2_querymenu</link>">
 <!ENTITY v4l2-rect "struct&nbsp;<link linkend='v4l2-rect'>v4l2_rect</link>">
@@ -202,6 +205,7 @@
 <!-- Subsections -->
 <!ENTITY sub-biblio SYSTEM "v4l/biblio.xml">
 <!ENTITY sub-common SYSTEM "v4l/common.xml">
+<!ENTITY sub-planar-apis SYSTEM "v4l/planar-apis.xml">
 <!ENTITY sub-compat SYSTEM "v4l/compat.xml">
 <!ENTITY sub-controls SYSTEM "v4l/controls.xml">
 <!ENTITY sub-dev-capture SYSTEM "v4l/dev-capture.xml">