Fix Realtime RC release notes (#1305)

* Fix capitalization of addonconfig

* mention (android/ios)

* fix wrapping

Author: AlmostMatt

release_build_files/readme.md

@@ -650,12 +650,12 @@ code.
     - Firestore: Added `Query::Count()`, which fetches the number of documents
       in the result set without actually downloading the documents
       ([#1207](https://github.com/firebase/firebase-cpp-sdk/pull/1207)).
-    - Remote Config: Added support for real-time config updates. Use the new
-      `addOnConfigUpdateListener` API to get real-time updates. Existing
-      [`Fetch`](https://firebase.google.com/docs/reference/cpp/class/firebase/remote-config/remote-config#fetch)
+    - Remote Config (Android/iOS): Added support for real-time config updates.
+      Use the new `AddOnConfigUpdateListener` API to get real-time updates.
+      Existing [`Fetch`](https://firebase.google.com/docs/reference/cpp/class/firebase/remote-config/remote-config#fetch)
       and [`Activate`](https://firebase.google.com/docs/reference/cpp/class/firebase/remote-config/remote-config#activate)
       APIs aren't affected by this change. To learn more, see
-  [Get started with Firebase Remote Config](https://firebase.google.com/docs/remote-config/get-started?platform=cpp#add-real-time-listener).
+      [Get started with Firebase Remote Config](https://firebase.google.com/docs/remote-config/get-started?platform=cpp#add-real-time-listener).
 
 ### 10.7.0
 -   Changes