migration-guides: Add coverage of addpylib directive

To complement what I am adding to the BitBake reference manual, add a
section in the 4.2 migration guide, a reference in the structure section
of the reference manual (where we talk about meta/lib) and adjust the
release notes item to be a little more concise.

(From yocto-docs rev: 0903e82a9da263c6d64aead03407eb377eb5bbfe)

Signed-off-by: Paul Eggleton <bluelightning@bluelightning.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/documentation/ref-manual/structure.rst b/documentation/ref-manual/structure.rst
index e895382eec..f1b11ad69b 100644
--- a/documentation/ref-manual/structure.rst
+++ b/documentation/ref-manual/structure.rst
@@ -750,7 +750,9 @@ and lists of files and directories with known permissions.
 -------------
 
 This directory contains OpenEmbedded Python library code used during the
-build process.
+build process. It is enabled via the ``addpylib`` directive in
+``meta/conf/local.conf``. For more information, see
+:ref:`bitbake-user-manual/bitbake-user-manual-metadata:extending python library code`.
 
 .. _structure-meta-recipes-bsp: