ref-manual: Fixed the reference to the script for icecc class.

(From yocto-docs rev: 0f3f134fe8292d6b1e6665c80d9e13a80c6c8326)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/ref-manual/ref-classes.xml

@@ -969,11 +969,11 @@
         If
         <link linkend='var-ICECC_ENV_EXEC'><filename>ICECC_ENV_EXEC</filename></link>
         is set in your <filename>local.conf</filename> file, the variable should
-        point to the <filename>icecc-create-env</filename> script provided by
-        the user.
+        point to the <filename>icecc-create-env</filename> script
+        provided by the user.
         If you do not point to a user-provided script, the build system
         uses the default script provided by the recipe
-        <filename>icecc-create-env.bb</filename>.
+        <filename>icecc-create-env-native.bb</filename>.
         <note>
             This script is a modified version and not the one that comes with
             <filename>icecc</filename>.