Comment combine podspecs that they should not be published (#8771)

Author: paulb777

FirebaseAuthTestingSupport.podspec

@@ -4,7 +4,8 @@ Pod::Spec.new do |s|
   s.summary                 = 'Firebase SDKs testing support types and utilities.'
 
   s.description      = <<-DESC
-  Type declarations and utilities needed for unit testing of the code dependent on Firebase SDKs
+  Type declarations and utilities needed for unit testing of the code dependent on Firebase SDKs.
+  This podspec is for internal testing only and should not be published.
                        DESC
 
   s.homepage                = 'https://developers.google.com/'

FirebaseCombineSwift.podspec

@@ -4,7 +4,8 @@ Pod::Spec.new do |s|
   s.summary          = 'Swift extensions with Combine support for Firebase'
 
   s.description      = <<-DESC
-Combine Publishers for Firebase.
+Firebase Combine is only supported with Swift Package Manager. This podspec is
+for internal testing only. It should not be published.
                        DESC
 
   s.homepage         = 'https://firebase.google.com'

FirebaseFirestoreTestingSupport.podspec

@@ -4,7 +4,8 @@ Pod::Spec.new do |s|
   s.summary                 = 'Firebase SDKs testing support types and utilities.'
 
   s.description      = <<-DESC
-  Type declarations and utilities needed for unit testing of the code dependent on Firebase SDKs
+  Type declarations and utilities needed for unit testing of the code dependent on Firebase SDKs.
+  This podspec is for internal testing only and should not be published.
                        DESC
 
   s.homepage                = 'https://developers.google.com/'

FirebaseFunctionsTestingSupport.podspec

@@ -4,7 +4,8 @@ Pod::Spec.new do |s|
   s.summary                 = 'Firebase SDKs testing support types and utilities.'
 
   s.description      = <<-DESC
-  Type declarations and utilities needed for unit testing of the code dependent on Firebase SDKs
+  Type declarations and utilities needed for unit testing of the code dependent on Firebase SDKs.
+  This podspec is for internal testing only and should not be published.
                        DESC
 
   s.homepage                = 'https://developers.google.com/'