bitbake: doc: update releases.rst

Add Walnascar as a supported release manual, and move Styhead to the
outdated release manuals.

(Bitbake rev: 629aff734794568510c30939a4584cee2e0185ec)

Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/doc/releases.rst

@@ -4,11 +4,11 @@
 BitBake Supported Release Manuals
 =================================
 
-****************************
-Release Series 5.1 (styhead)
-****************************
+******************************
+Release Series 5.2 (walnascar)
+******************************
 
-- :yocto_docs:`BitBake 2.10 User Manual </bitbake/2.10/>`
+- :yocto_docs:`BitBake 2.12 User Manual </bitbake/2.12/>`
 
 *******************************
 Release Series 5.0 (scarthgap)
@@ -26,6 +26,12 @@ Release Series 4.0 (kirkstone)
 BitBake Outdated Release Manuals
 ================================
 
+****************************
+Release Series 5.1 (styhead)
+****************************
+
+- :yocto_docs:`BitBake 2.10 User Manual </bitbake/2.10/>`
+
 *******************************
 Release Series 4.3 (nanbield)
 *******************************