ref-manual: Edits to native class.

(From yocto-docs rev: 3f026aa351be7c39ea0927df3599012abadf9364)

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

@@ -1599,7 +1599,7 @@
     <title><filename>native.bbclass</filename></title>
 
     <para>
-        The native (<filename>native</filename>) class provides common
+        The <filename>native</filename> class provides common
         functionality for recipes that wish to build tools to run on the build
         host (i.e. tools that use the compiler or other tools from the
         build host).