[x265] [PATCH] doc: update docs for HDR/WCG offsets feature

[gopi.satykrishna at multicorewareinc.com]

# HG changeset patch
# User Gopi Satykrishna Akisetty <gopi.satykrishna at multicorewareinc.com>
# Date 1490355868 -19800
#      Fri Mar 24 17:14:28 2017 +0530
# Node ID 868832df35ac0dfc4f3a74e2af192be2887fcde3
# Parent  a0eee4b41185efb6b18dc05f975089a0978e8c9a
doc: update docs for HDR/WCG offsets feature

diff -r a0eee4b41185 -r 868832df35ac doc/reST/cli.rst
--- a/doc/reST/cli.rst	Fri Mar 10 14:48:32 2017 +0530
+++ b/doc/reST/cli.rst	Fri Mar 24 17:14:28 2017 +0530
@@ -1869,6 +1869,7 @@
 
 	Add luma and chroma offsets for HDR/WCG content.
 	Input video should be 10 bit 4:2:0. Applicable for HDR content.
+	AQ should be enabled for using this feature.
 	Default disabled. **Experimental Feature**
 
 .. option:: --min-luma <integer>