Release note for StreamField data migration helpers (#9694)

CHANGELOG.txt

@@ -4,6 +4,7 @@ Changelog
 4.2 (xx.xx.xxxx) - IN DEVELOPMENT
 ~~~~~~~~~~~~~~~~
 
+ * Added StreamField data migration helpers (Sandil Ranasinghe, Jacob Topp-Mugglestone, Joshua Munn, Karl Hobley)
  * Switch to using Willow instead of Pillow for images (Darrel O'Pry)
  * Test assertion util `WagtailPageTestCase.assertCanCreate` now supports the kwarg `publish=True` to check publish redirection (Harry Percival, Akua Dokua Asiedu)
  * Ensure that the `rebuild_references_index` command can run without console output if called with `--verbosity 0` (Omerzahid Ali, Aman Pandey)

docs/advanced_topics/streamfield_migrations.md

@@ -177,6 +177,8 @@ class Migration(migrations.Migration):
     ]
 ```
 
+(streamfield_data_migrations)=
+
 ## StreamField data migrations
 
 ```{versionadded} 4.2

docs/releases/4.2.md

@@ -11,6 +11,9 @@ depth: 1
 
 ## What's new
 
+### StreamField data migration helpers
+
+Wagtail now provides a set of utilities for creating data migrations on StreamField data. For more information, see [StreamField data migrations](streamfield_data_migrations). This feature was developed by Sandil Ranasinghe, initially as the [wagtail-streamfield-migration-toolkit](https://github.com/wagtail/wagtail-streamfield-migration-toolkit) add-on package, as part of the Google Summer of Code 2022 initiative, with support from Jacob Topp-Mugglestone, Joshua Munn and Karl Hobley.
 
 ### Other features