ref-manual: Edits to cross class.

(From yocto-docs rev: 753381179f1fca0a93566c5c2c41165291bc2f70)

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

@@ -453,8 +453,8 @@
     <title><filename>cross.bbclass</filename></title>
 
     <para>
-        The cross-compilation (<filename>cross</filename>) class
-        provides support for cross-compilation tools.
+        The <filename>cross</filename>)class provides support for
+        cross-compilation tools.
     </para>
 </section>