ref-manual: Edits to buildstats class.

(From yocto-docs rev: 65bd888495f38cc83e5c5475d6afbc54802e6a34)

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

@@ -314,7 +314,7 @@
     <title><filename>buildstats.bbclass</filename></title>
 
     <para>
-        The Build Stats (<filename>buildstats</filename>) class records
+        The <filename>buildstats</filename> class records
         performance statistics about each task executed during the build
         (e.g. elapsed time, CPU usage, and I/O usage).
     </para>