Update community branch info

Author: krollins-mdb

source/deprecation.txt

@@ -74,10 +74,11 @@ Device SDKs Community Branches
 ------------------------------
 
 The Device SDKs will have community branches that remove Device Sync code from
-their codebases. Learn more in the SDKs' README files:
-
-- `Flutter <https://github.com/realm/realm-dart>`__
-- `Kotlin <https://github.com/realm/realm-kotlin>`__
-- `.NET <https://github.com/realm/realm-dotnet>`__
-- `JavaScript <https://github.com/realm/realm-js>`__
-- `Swift <https://github.com/realm/realm-swift>`__
+their codebases. Check out the community branches for the following SDKs:
+
+- `C++ <https://github.com/realm/realm-cpp/tree/community>`__
+- `Flutter <https://github.com/realm/realm-dart/tree/community>`__
+- `Kotlin <https://github.com/realm/realm-kotlin/tree/communityn>`__
+- `.NET <https://github.com/realm/realm-dotnet/tree/community>`__
+- `JavaScript <https://github.com/realm/realm-js/tree/community>`__
+- `Swift <https://github.com/realm/realm-swift/tree/community>`__