Update Apple Silicon instructions (#7407)

Author: paulb777

AppleSilicon.md

@@ -5,50 +5,15 @@ using Xcode 12.0 or above. See the instructions below for CocoaPods and Carthage
 
 ## CocoaPods
 
-All source-based Firebase CocoaPods work as expected. Binary pods require CocoaPopds version 1.10.0
-and are listed below with the current status.
+Starting with Firebase 7.5.0, Firebase supports Apple Silicon Macs via CocoaPods. *CocoaPods 1.10.0
+is required.*
 
-### Analytics + GoogleAppMeasurement
-
-As of Firebase 7.2.0, FirebaseAnalytics and GoogleAppMeasurement provide a separate distribution of
-an XCFramework in order to work around an issue with CocoaPods and static XCFrameworks.
-
-**IMPORTANT**: After adding the CocoaPod, you must manually add `-ObjC` to your `Other Linker Flags`
-in order to avoid a runtime crash.
-
-This is a temporary workaround while Analytics is affected by the CocoaPods bug.
-
-When specifying which version of Firebase you'd like in your Podfile, append `-M1` to the version.
-See the following examples:
-
-```
-# Explicitly require the special `M1` tagged Firebase version, locked to the exact version. Note
-# that due to the version scheme, you're required to update this manually for each release otherwise
-# you will revert to the official release (ex. `7.2.0` instead of `7.2.0-M1`).
-pod 'Firebase/Analytics', '7.2-M1'
-
-# Do the same for any other Firebase pod used.
-pod 'Firebase/Database', '7.2-M1'
-```
-
-Remember: now you need to manually add `-ObjC` to avoid a runtime crash. This CocoaPods issue has
-been fixed in
-[CocoaPods/CocoaPods#10234](https://github.com/CocoaPods/CocoaPods/pull/10234) and is merged for
-the upcoming CocoaPods 1.10.1 patch release.
-
-### Performance
-
-As of Firebase 7.2.0, FirebasePerformance uses an XCFramework for distribution that works with
-Apple silicon.
-
-### FirebaseML
-
-FirebaseML does not yet work with the simulator on Apple silicon Macs.
+The special `M1` versions required for FirebaseAnalytics support for versions 7.2.0 through 7.4.0
+are no longer necessary.
 
 ## Carthage
 
 XCFrameworks are required to include the arm64 slice for iOS devices and the macOS simulator for
 Macs running on Apple silicon. Unfortunately, Carthage does not support XCFrameworks yet which
 prevents us from being able to include support. See
 [Carthage/Carthage#2799](https://github.com/Carthage/Carthage/issues/2799) for progress.
-