Update immutable-tags.md (#22895)

Updated immutable tags docs to include the option to provide an regex

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Co-authored-by: Craig Osterhout <[email protected]>

Author: sheltongraves

content/manuals/docker-hub/repos/manage/hub-images/immutable-tags.md

@@ -25,15 +25,20 @@ To enable immutable tags for your repository:
 1. Sign in to [Docker Hub](https://hub.docker.com).
 2. Select **My Hub** > **Repositories**.
 3. Select the repository where you want to enable immutable tags.
-4. Select the **Settings** tab
-5. Under **Tag mutability settings**, select **Immutable**.
+4. Go to **Settings** > **General**.
+5. Under **Tag mutability settings**, select one of the following options:
+   - **All tags are mutable (Default)**:  
+     Tags can be changed to reference a different image. This lets you retarget a tag without creating a new one.
+   - **All tags are immutable**:  
+     Tags cannot be updated to point to a different image after creation. This ensures consistency and prevents accidental changes. This includes the `latest` tag.
+   - **Specific tags are immutable**:  
+     Define specific tags that cannot be updated after creation using regex values.
 6. Select **Save**.
 
 Once enabled, all tags are locked to their specific images, ensuring that each tag always points to the same image version and cannot be modified.
 
- > [!NOTE]
->
-> All tags in the repository become immutable, including the `latest` tag.
+> [!NOTE]
+> This implementation of regular expressions follows the [Go regexp package](https://pkg.go.dev/regexp), which is based on the RE2 engine. For more information, visit [RE2 Regular Expression Syntax](https://github.com/google/re2/wiki/Syntax).
 
 ## Working with immutable tags
 
@@ -48,3 +53,8 @@ To push an image, create a new tag for your updated image and push it to the rep
 
 
 
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