Thanks for the PR @asvetlov.    Could we also slightly mention the purpose/benefit of the slots? Also, it might help to explicit mention that we're specifically talking about the transport *classes*, so it makes more sense as to what is being referred to.     ```suggestion  Add slots to :mod:`asyncio` transport classes, which can reduce memory usage.  ```    Also added a Sphinx role to link to the module itself. Not 100% needed for a Misc/NEWS entry, but it doesn't hurt.