docs: point to "firebase.google" domain for hyperlinks in the usage s…

…ection of `README.md` files (for the missing packages) (#8818)

* cloud_firestore: point to new docs in `README.md`

* cloud_functions: point to new docs in `README.md`

* firebase_app_check: point to new docs in `README.md`

* firebase_app_installations: point to new docs in `README.md`

* firebase_core: point to new docs in `README.md`

* firebase_crashlytics: point to new docs in `README.md`

* firebase_dynamic_links: point to new docs in `README.md`

* firebase_in_app_messaging: point to new docs in `README.md`

* firebase_ml_model_downloader: point to new docs in `README.md`

* firebase_performance: point to new docs in `README.md`

* firebase_remote_config: point to new docs in `README.md`

* Update packages/firebase_analytics/firebase_analytics/README.md

Co-authored-by: Russell Wheatley <russellwheatley85@gmail.com>

* Update packages/cloud_functions/cloud_functions/README.md

Co-authored-by: Russell Wheatley <russellwheatley85@gmail.com>

Co-authored-by: Russell Wheatley <russellwheatley85@gmail.com>

packages/cloud_functions/cloud_functions/README.md

@@ -13,7 +13,7 @@ To get started with Cloud Functions for Firebase, please [see the documentation]
 
 ## Usage
 
-To use this plugin, please visit the [Functions Usage documentation](https://firebase.flutter.dev/docs/functions/usage)
+To use this plugin, please visit the [Functions Usage documentation](https://firebase.google.com/docs/functions/callable#dart)
 
 ## Issues and feedback
 

packages/firebase_analytics/firebase_analytics/README.md

@@ -12,7 +12,7 @@ To get started with Firebase Analytics for Flutter, please [see the documentatio
 
 ## Usage
 
-To use this plugin, please visit the [Analytics Usage documentation](https://firebase.flutter.dev/docs/analytics/usage)
+To use this plugin, please visit the [Analytics Usage documentation](https://firebase.google.com/docs/analytics/events?platform=flutter)
 
 ## Issues and feedback
 

packages/firebase_app_check/firebase_app_check/README.md

@@ -11,7 +11,7 @@ To get started with Firebase App Check for Flutter, please [see the documentatio
 
 ## Usage
 
-To use this plugin, please visit the [App Check Usage documentation](https://firebase.flutter.dev/docs/app-check/usage)
+To use this plugin, please visit the [App Check Usage documentation](https://firebase.google.com/docs/app-check/flutter/default-providers#initialize)
 
 ## Issues and feedback
 

packages/firebase_app_installations/firebase_app_installations/README.md

@@ -10,7 +10,7 @@ To get started with Firebase Installations for Flutter, please [see the document
 
 ## Usage
 
-To use this plugin, please visit the [Installations Usage documentation](https://firebase.flutter.dev/docs/installations/usage)
+To use this plugin, please visit the [Installations Usage documentation](https://firebase.google.com/docs/projects/manage-installations#flutter)
 
 ## Issues and feedback
 

packages/firebase_core/firebase_core/README.md

@@ -14,7 +14,7 @@ To get started with FlutterFire, please [see the documentation](https://firebase
 
 ## Usage
 
-To use this plugin, please visit the [Core Usage documentation](https://firebase.flutter.dev/docs/core/usage)
+To use this plugin, please visit the [Core Usage documentation](https://firebase.google.com/docs/flutter/setup)
 
 ## Issues and feedback
 

packages/firebase_crashlytics/firebase_crashlytics/README.md

@@ -14,7 +14,7 @@ To get started with Crashlytics for Flutter, please [see the documentation](http
 
 ## Usage
 
-To use this plugin, please visit the [Crashlytics Usage documentation](https://firebase.flutter.dev/docs/crashlytics/usage)
+To use this plugin, please visit the [Crashlytics Usage documentation](https://firebase.google.com/docs/crashlytics/get-started?platform=flutter)
 
 ## Issues and feedback
 

packages/firebase_dynamic_links/firebase_dynamic_links/README.md

@@ -13,7 +13,7 @@ To get started with Dynamic Links for Flutter, please [see the documentation](ht
 
 ## Usage
 
-To use this plugin, please visit the [Dynamic Links Usage documentation](https://firebase.flutter.dev/docs/dynamic-links/usage)
+To use this plugin, please visit the [Dynamic Links Usage documentation](https://firebase.google.com/docs/dynamic-links/flutter/create)
 
 ## Issues and feedback
 

packages/firebase_in_app_messaging/firebase_in_app_messaging/README.md

@@ -12,7 +12,7 @@ To get started with Firebase In-App Messaging for Flutter, please [see the docum
 
 ## Usage
 
-To use this plugin, please visit the [Firebase In-App Messaging Usage documentation](https://firebase.flutter.dev/docs/in-app-messaging/usage)
+To use this plugin, please visit the [Firebase In-App Messaging Usage documentation](https://firebase.google.com/docs/in-app-messaging/get-started?platform=flutter)
 
 ## Issues and feedback
 

packages/firebase_ml_model_downloader/firebase_ml_model_downloader/README.md

@@ -9,7 +9,7 @@ To get started with Firebase ML Model Downloader, please [see the documentation]
 
 ## Usage
 
-To use this plugin, please visit the [Firebase ML Model Downloader Usage documentation](https://firebase.flutter.dev/docs/ml/usage)
+To use this plugin, please visit the [Firebase ML Model Downloader Usage documentation](https://firebase.google.com/docs/ml/flutter/use-custom-models)
 
 ## Issues and feedback
 

packages/firebase_performance/firebase_performance/README.md

@@ -12,7 +12,7 @@ To get started with Firebase Performance for Flutter, please [see the documentat
 
 ## Usage
 
-To use this plugin, please visit the [Firebase Performance Usage documentation](https://firebase.flutter.dev/docs/performance/usage)
+To use this plugin, please visit the [Firebase Performance Usage documentation](https://firebase.google.com/docs/perf-mon/flutter/get-started)
 
 ## Issues and feedback
 

packages/firebase_remote_config/firebase_remote_config/README.md

@@ -13,7 +13,7 @@ at [https://firebase.flutter.dev](https://firebase.flutter.dev)
 
 ## Usage
 
-To use this plugin, please visit the [Firebase Remote Config Usage documentation](https://firebase.flutter.dev/docs/remote-config/usage)
+To use this plugin, please visit the [Firebase Remote Config Usage documentation](https://firebase.google.com/docs/remote-config/get-started?platform=flutter)
 
 ## Issues and feedback