docs: Managed Folders samples

[sydney-munro]

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Fixes #<issue_number_goes_here> ☕️

If you write sample code, please follow the samples format.

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• samples/snippets/src/main/java/com/example/storage/managedfolders/CreateManagedFolder.java:19, tag storage_control_managed_folder_create
• samples/snippets/src/main/java/com/example/storage/managedfolders/DeleteManagedFolder.java:19, tag storage_control_managed_folder_delete
• samples/snippets/src/main/java/com/example/storage/managedfolders/GetManagedFolder.java:19, tag storage_control_managed_folder_get
• samples/snippets/src/main/java/com/example/storage/managedfolders/ListManagedFolders.java:19, tag storage_control_managed_folder_list

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[BenWhitehead]

Thanks for the fixes!

[sydney-munro]

/gcbrun