documentation: Fixed links to "bitbake-term"

Fixes [YOCTO #11630]

Moving the "Yocto Project Terms" section from the dev-manual to
the ref-manual.  Doing so caused all the links to the id
"bitbake-term" to break.  These had to be individually fixed.

Discovered two unresolved references that were a consequence of
moving that section to the ref-manual.  These were fixed as well.

(From yocto-docs rev: 829ca6b64562f00a69f3956e9636c7edaa90ce16)

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

documentation/bsp-guide/bsp.xml

@@ -522,7 +522,7 @@
 
                 <para>
                     This file simply makes
-                    <ulink url='&YOCTO_DOCS_DEV_URL;#bitbake-term'>BitBake</ulink>
+                    <ulink url='&YOCTO_DOCS_REF_URL;#bitbake-term'>BitBake</ulink>
                     aware of the recipes and configuration directories.
                     The file must exist so that the OpenEmbedded build system can recognize the BSP.
                 </para>