docs: add migration guide snippet

docs/guide/upgrading_v9/2791.md

@@ -0,0 +1,7 @@
+### Fix Tree Shaking
+
+Prior to this version, users had to resort to workarounds by importing specific faker instances from dedicated paths to overcome tree shaking issues. 
+With the implementation of this fix, such workarounds should no longer be necessary.
+The dedicated import paths will still stay for now, to allow a graduate migration for our users.
+
+While the implementation of this change does not constitute as breaking according to semantic versioning guidelines, it does impact the behavior of users bundlers.