Revert "Merge pull request #37881 from pierredemilly/patch-1"

This reverts commit 5bbb2a65, reversing
changes made to f9e4906c.

Reason: Since #36866, we use `azure-storage-blob` gem. So the original
description is correct.

guides/source/active_storage_overview.md

@@ -147,10 +147,10 @@ azure:
   container: ""
 ```
 
-Add the [`azure-storage`](https://rubygems.org/gems/azure-storage/versions/0.15.0.preview) gem to your `Gemfile`:
+Add the [`azure-storage-blob`](https://github.com/Azure/azure-storage-ruby) gem to your `Gemfile`:
 
 ```ruby
-gem "azure-storage", require: false
+gem "azure-storage-blob", require: false
 ```
 
 ### Google Cloud Storage Service