[clutter/clutter-1.20] doc: Document CLUTTER_SCALE envvar

[Emmanuele Bassi <ebassi src gnome org>]

commit fe208bff29191bfa13f01b69e31e49e83c80c650
Author: Bastien Nocera <hadess hadess net>
Date:   Fri Aug 8 14:50:55 2014 +0200

    doc: Document CLUTTER_SCALE envvar
    
    https://bugzilla.gnome.org/show_bug.cgi?id=734480

 doc/reference/clutter/running-clutter.xml |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/doc/reference/clutter/running-clutter.xml b/doc/reference/clutter/running-clutter.xml
index 0469ead..9d1dc63 100644
--- a/doc/reference/clutter/running-clutter.xml
+++ b/doc/reference/clutter/running-clutter.xml
@@ -27,6 +27,13 @@
 
       <variablelist>
         <varlistentry>
+          <term>CLUTTER_SCALE</term>
+          <listitem>
+            <para>Forces the window scaling factor to that value
+            inside Clutter instead of relying on what backends detect.</para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
           <term>CLUTTER_TEXT_DIRECTION</term>
           <listitem>
             <para>Forces the text direction of every Pango layout