Merge pull request #3428 from tseaver/3181-storage-docs-scrub_acl_chaining

Scrub mention of no-longer-chainable ACL methods.

Author: tseaver

storage/google/cloud/storage/acl.py

@@ -53,13 +53,6 @@
    :start-after: [START acl_user_settings]
    :end-before: [END acl_user_settings]
 
-You can also chain these ``grant_*`` and ``revoke_*`` methods together
-for brevity:
-
-.. literalinclude:: storage_snippets.py
-   :start-after: [START acl_revoke_write]
-   :end-before: [END acl_revoke_write]
-
 After that, you can save any changes you make with the
 :func:`google.cloud.storage.acl.ACL.save` method: