Unify to use 4 spaces indentation in CHANGELOGs [ci skip]

Especially, somehow `CHANGELOG.md` in actiontext and activestorage in
master branch had used 3 spaces indentation.

1 files changed, 42 insertions, 41 deletions

diff --git a/activestorage/CHANGELOG.md b/activestorage/CHANGELOG.md
index 2d9fe56858..fdb0f143f4 100644
--- a/activestorage/CHANGELOG.md
+++ b/activestorage/CHANGELOG.md
@@ -1,59 +1,60 @@
-*  Image analysis is skipped if ImageMagick returns an error.
+*   Image analysis is skipped if ImageMagick returns an error.
 
-   `ActiveStorage::Analyzer::ImageAnalyzer#metadata` would previously raise a
-   `MiniMagick::Error`, which caused persistent `ActiveStorage::AnalyzeJob`
-   failures. It now logs the error and returns `{}`, resulting in no metadata
-   being added to the offending image blob.
+    `ActiveStorage::Analyzer::ImageAnalyzer#metadata` would previously raise a
+    `MiniMagick::Error`, which caused persistent `ActiveStorage::AnalyzeJob`
+    failures. It now logs the error and returns `{}`, resulting in no metadata
+    being added to the offending image blob.
 
-   *George Claghorn*
+    *George Claghorn*
 
-*  Method calls on singular attachments return `nil` when no file is attached.
+*   Method calls on singular attachments return `nil` when no file is attached.
 
-   Previously, assuming the following User model, `user.avatar.filename` would
-   raise a `Module::DelegationError` if no avatar was attached:
+    Previously, assuming the following User model, `user.avatar.filename` would
+    raise a `Module::DelegationError` if no avatar was attached:
 
-   ```ruby
-   class User < ApplicationRecord
-     has_one_attached :avatar
-   end
-   ```
+    ```ruby
+    class User < ApplicationRecord
+      has_one_attached :avatar
+    end
+    ```
 
-   They now return `nil`.
+    They now return `nil`.
 
-   *Matthew Tanous*
+    *Matthew Tanous*
 
-*  The mirror service supports direct uploads.
+*   The mirror service supports direct uploads.
 
-   New files are directly uploaded to the primary service. When a
-   directly-uploaded file is attached to a record, a background job is enqueued
-   to copy it to each secondary service.
+    New files are directly uploaded to the primary service. When a
+    directly-uploaded file is attached to a record, a background job is enqueued
+    to copy it to each secondary service.
 
-   Configure the queue used to process mirroring jobs by setting
-   `config.active_storage.queues.mirror`. The default is `:active_storage_mirror`.
+    Configure the queue used to process mirroring jobs by setting
+    `config.active_storage.queues.mirror`. The default is `:active_storage_mirror`.
 
-   *George Claghorn*
+    *George Claghorn*
 
-*  The S3 service now permits uploading files larger than 5 gigabytes.
+*   The S3 service now permits uploading files larger than 5 gigabytes.
 
-   When uploading a file greater than 100 megabytes in size, the service
-   transparently switches to [multipart uploads](https://docs.aws.amazon.com/AmazonS3/latest/dev/mpuoverview.html)
-   using a part size computed from the file's total size and S3's part count limit.
+    When uploading a file greater than 100 megabytes in size, the service
+    transparently switches to [multipart uploads](https://docs.aws.amazon.com/AmazonS3/latest/dev/mpuoverview.html)
+    using a part size computed from the file's total size and S3's part count limit.
 
-   No application changes are necessary to take advantage of this feature. You
-   can customize the default 100 MB multipart upload threshold in your S3
-   service's configuration:
+    No application changes are necessary to take advantage of this feature. You
+    can customize the default 100 MB multipart upload threshold in your S3
+    service's configuration:
 
-   ```yaml
-   production:
-     service: s3
-     access_key_id: <%= Rails.application.credentials.dig(:aws, :access_key_id) %>
-     secret_access_key: <%= Rails.application.credentials.dig(:aws, :secret_access_key) %>
-     region: us-east-1
-     bucket: my-bucket
-     upload:
-       multipart_threshold: <%= 250.megabytes %>
-   ```
+    ```yaml
+    production:
+      service: s3
+      access_key_id: <%= Rails.application.credentials.dig(:aws, :access_key_id) %>
+      secret_access_key: <%= Rails.application.credentials.dig(:aws, :secret_access_key) %>
+      region: us-east-1
+      bucket: my-bucket
+      upload:
+        multipart_threshold: <%= 250.megabytes %>
+    ```
+
+    *George Claghorn*
 
-   *George Claghorn*
 
 Please check [6-0-stable](https://github.com/rails/rails/blob/6-0-stable/activestorage/CHANGELOG.md) for previous changes.