[poky] [PATCH] fix a typo in usermanual on lazy default

[Qing He]

"??= ... is a lazy version of ??=", the second should be ?=

Signed-off-by: Qing He <qing.he at intel.com>

---
diff --git a/bitbake/doc/manual/usermanual.xml b/bitbake/doc/manual/usermanual.xml
index 748ac31..2b7a0b5 100644
--- a/bitbake/doc/manual/usermanual.xml
+++ b/bitbake/doc/manual/usermanual.xml
@@ -97,7 +97,7 @@ share common metadata between many packages.</para></listitem>
                 <title>Setting a default value (??=)</title>
                 <para><screen><varname>A</varname> ??= "somevalue"</screen></para>
                 <para><screen><varname>A</varname> ??= "someothervalue"</screen></para>
-                <para>If <varname>A</varname> is set before the above, it will retain that value.  If <varname>A</varname> is unset prior to the above, <varname>A</varname> will be set to <literal>someothervalue</literal>.  This is a lazy version of ??=, in that the assignment does not occur until the end of the parsing process, so that the last, rather than the first, ??= assignment to a given variable will be used.</para>
+                <para>If <varname>A</varname> is set before the above, it will retain that value.  If <varname>A</varname> is unset prior to the above, <varname>A</varname> will be set to <literal>someothervalue</literal>.  This is a lazy version of ?=, in that the assignment does not occur until the end of the parsing process, so that the last, rather than the first, ??= assignment to a given variable will be used.</para>
             </section>
             <section>
                 <title>Immediate variable expansion (:=)</title>