[PATCH] DocBook media: fix BT.2020 description

[Hans Verkuil]

One number was wrong (0.6789 -> 0.6780) and Y' should have been Yc'.

Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>

diff --git a/Documentation/DocBook/media/v4l/pixfmt.xml 
b/Documentation/DocBook/media/v4l/pixfmt.xml
index 13540fa..05b595c 100644
--- a/Documentation/DocBook/media/v4l/pixfmt.xml
+++ b/Documentation/DocBook/media/v4l/pixfmt.xml
@@ -1025,7 +1025,7 @@ the white reference are:</para>
          <term>The luminance (Y') and color difference (Cb and Cr) are 
obtained with the
 following <constant>V4L2_YCBCR_ENC_BT2020</constant> encoding:</term>
          <listitem>
-            
<para>Y'&nbsp;=&nbsp;0.2627R'&nbsp;+&nbsp;0.6789G'&nbsp;+&nbsp;0.0593B'</para>
+            
<para>Y'&nbsp;=&nbsp;0.2627R'&nbsp;+&nbsp;0.6780G'&nbsp;+&nbsp;0.0593B'</para>
             
<para>Cb&nbsp;=&nbsp;-0.1396R'&nbsp;-&nbsp;0.3604G'&nbsp;+&nbsp;0.5B'</para>
             
<para>Cr&nbsp;=&nbsp;0.5R'&nbsp;-&nbsp;0.4598G'&nbsp;-&nbsp;0.0402B'</para>
          </listitem>
@@ -1039,7 +1039,7 @@ clamped to the range [-0.5&hellip;0.5]. The Y'CbCr 
quantization is limited range
        <varlistentry>
          <term>Luma:</term>
          <listitem>
-            
<para>Yc'&nbsp;=&nbsp;(0.2627R&nbsp;+&nbsp;0.6789G&nbsp;+&nbsp;0.0593B)'</para>
+            
<para>Yc'&nbsp;=&nbsp;(0.2627R&nbsp;+&nbsp;0.6780G&nbsp;+&nbsp;0.0593B)'</para>
          </listitem>
        </varlistentry>
       </variablelist>
@@ -1047,7 +1047,7 @@ clamped to the range [-0.5&hellip;0.5]. The Y'CbCr 
quantization is limited range
        <varlistentry>
          <term>B'&nbsp;-&nbsp;Yc'&nbsp;&le;&nbsp;0:</term>
          <listitem>
-            <para>Cbc&nbsp;=&nbsp;(B'&nbsp;-&nbsp;Y')&nbsp;/&nbsp;1.9404</para>
+            
<para>Cbc&nbsp;=&nbsp;(B'&nbsp;-&nbsp;Yc')&nbsp;/&nbsp;1.9404</para>
          </listitem>
        </varlistentry>
       </variablelist>
@@ -1055,7 +1055,7 @@ clamped to the range [-0.5&hellip;0.5]. The Y'CbCr 
quantization is limited range
        <varlistentry>
          <term>B'&nbsp;-&nbsp;Yc'&nbsp;&gt;&nbsp;0:</term>
          <listitem>
-            <para>Cbc&nbsp;=&nbsp;(B'&nbsp;-&nbsp;Y')&nbsp;/&nbsp;1.5816</para>
+            
<para>Cbc&nbsp;=&nbsp;(B'&nbsp;-&nbsp;Yc')&nbsp;/&nbsp;1.5816</para>
          </listitem>
        </varlistentry>
       </variablelist>
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