[Buildroot] [RFC 2/2] docs/manual/migrating.txt: add "individual packages" section

[Arnout Vandecappelle (Essensium/Mind)]

Add a section to the migrating documentation to explain what changed in
individual packages and how it may affect your build.

This section is organised per package, not per Buildroot release,
because in general it's easier to check package per package if anything
changed than to check release per release for all your packages.

The idea is that every time a package is changed in a way that is not
immediately obvious (mainly: affects runtime but not build time), it is
mentioned in this section. This may include:

- a new version of the package got a new name due to API
  incompatibilities;
- the default behaviour or config optoins of the package changed;
- the Buildroot integration (e.g. configuration file, init script) of
  the package changed;
- what is installed by the package is changed (e.g. executable is
  renamed or removed).

To start with, add the recent changes of the installation defaults of
bluez5_utils.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout at mind.be>
---
 docs/manual/migrating.txt | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/docs/manual/migrating.txt b/docs/manual/migrating.txt
index 9fd7d7e676..36e4aa4724 100644
--- a/docs/manual/migrating.txt
+++ b/docs/manual/migrating.txt
@@ -22,8 +22,8 @@ To migrate from an older Buildroot version, take the following steps.
   the existing +.config+.
 . If anything is enabled in the Legacy menu, check its help text,
   unselect it, and save the configuration.
-. Review the CHANGES file to see if any of your packages and features
-  are affected by the changes.
+. Review the individual packages section below to see if any of your
+  packages are affected by the changes.
 . Build in the new Buildroot environment.
 . Fix build issues in external packages (usually due to updated
   dependencies).
@@ -36,6 +36,17 @@ To migrate from an older Buildroot version, take the following steps.
 . Run +make savedefconfig+ and verify that what is selected really is
   what you intended to enable.
 
+[[migrating-packages]]
+=== Individual packages
+
+This section describes changes to individual packages. For all packages
+that are built in your configuration, check below if changes are needed.
+
+==== bluez5_utils
+
+Since 2021.08, the tools and all plugins are optional and default off.
+Make sure to enable the plugins you require.
+
 [[br2-external-converting]]
 === Migrating to 2016.11
 
-- 
2.31.1