ref-manual: Updated the remove-libtool.bbclass description.

(From yocto-docs rev: de35e72836ebc75aa1f9614fa034631dd7d2a611)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/ref-manual/ref-classes.xml

@@ -2901,8 +2901,11 @@
 
     <para>
         If a recipe needs the <filename>.la</filename> files to be installed,
-        then the recipe can be overridden by setting the
-        <filename>REMOVE_LIBTOOL_LA</filename> variable.
+        then the recipe can override the removal by setting
+        <filename>REMOVE_LIBTOOL_LA</filename> to "0" as follows:
+        <literallayout class='monospaced'>
+     REMOVE_LIBTOOL_LA = "0"
+        </literallayout>
         <note>
             The <filename>remove-libtool</filename> class is not enabled by
             default.