doc: release: mention new video-sw-generator snippet

This snippet got introduced, and is not a breaking change for C APIs but
still introduce a change of command line to use for building projects,
so add a migration guide entry.

Signed-off-by: Josuah Demangeon <me@josuah.net>

Author: josuah

doc/releases/migration-guide-4.2.rst

@@ -718,6 +718,9 @@ Video
   size on a per driver basis. Existing applications will not be broken by this change but can be
   simplified as performed in the sample in the commit ``33dcbe37cfd3593e8c6e9cfd218dd31fdd533598``.
 
+* Samples and projects using the :ref:`native simulator <native_sim>` now require specifying the
+  ``--snippet`` :ref:`video-sw-generator <snippet-video-sw-generator>` to build correctly.
+
 Audio
 =====
 

doc/releases/release-notes-4.2.rst

@@ -278,6 +278,7 @@ New APIs and options
   * :c:func:`video_api_ctrl_t`
   * :c:func:`video_query_ctrl`
   * :c:func:`video_print_ctrl`
+  * :ref:`video-sw-generator <snippet-video-sw-generator>`
 
 * PCIe