ref-manual: Edits to gzipnative class.

(From yocto-docs rev: 4294792a9ef590945a2adc91ddd75456e7ea80b2)

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

@@ -814,7 +814,7 @@
     <title><filename>gzipnative.bbclass</filename></title>
 
     <para>
-        The <filename>gzip</filename> native (<filename>gzipnative</filename>)
+        The <filename>gzipnative</filename>
         class enables the use of native versions of <filename>gzip</filename>
         and <filename>pigz</filename> rather than the system versions.
     </para>