Xcode 12.2 and other doc updates (#8021)

Author: paulb777

AppleSilicon.md

@@ -106,7 +106,7 @@ Instructions for the experimental Carthage distribution are at
 To develop Firebase software in this repository, ensure that you have at least
 the following software:
 
-  * Xcode 12.0 (or later)
+  * Xcode 12.2 (or later)
 
 CocoaPods is still the canonical way to develop, but much of the repo now supports
 development with Swift Package Manager.

README.md

@@ -16,7 +16,7 @@ CocoaPods.
 
 In order to build the Zip file, you will need:
 
-- Xcode 11.0
+- Xcode 12.2
 - CocoaPods
 - An internet connection to fetch CocoaPods
 

ReleaseTooling/README.md

@@ -9,7 +9,7 @@ Each Firebase component requires several frameworks in order to function
 properly. Each section below lists the frameworks you'll need to include
 in your project in order to use that Firebase SDK in your application.
 
-Xcode 12.0 or newer is required.
+Xcode 12.2 or newer is required.
 
 To integrate a Firebase SDK with your app:
 

ReleaseTooling/Template/README.md

@@ -3,16 +3,18 @@
 ## Introduction
 
 Starting with the 6.31.0 release, Firebase supports installation via [Swift
-Package Manager](https://swift.org/package-manager/) in Beta status.
+Package Manager](https://swift.org/package-manager/) in Beta status. Exiting Beta is targeted for
+the 8.0.0 release.
 
 
 ## Limitations
 
-- Requires Xcode 12.
+- Requires Xcode 12.5
 - Analytics requires clients to add `-ObjC` linker option.
 - Analytics is only supported for iOS and cannot be used in apps that support other platforms.
 - Performance is not yet available.
-- watchOS support is available for Auth, Crashlytics, Messaging, Realtime Database, RemoteConfig, and Storage.
+- watchOS support is available for Auth, Crashlytics, Messaging, Realtime Database, RemoteConfig,
+  and Storage.
 
 ## Installation
 
@@ -42,11 +44,6 @@ Choose the Firebase products that you want installed in your app.
 If you've installed FirebaseAnalytics, Add the `-ObjC` option to `Other Linker Flags`
 in the `Build Settings` tab.
 
-If you're using FirebaseAnalytics, Xcode 12.0, and have an issue with
-device installation or archive uploading, see the workaround at
-https://github.com/firebase/firebase-ios-sdk/issues/6472#issuecomment-694449182.
-This issue looks to be resolved in Xcode 12.5.
-
 <img src="docs/resources/SPMObjC.png">
 
 If you're using FirebaseCrashlytics, you can use