Update third-party library removal policy (#14636)

Author: donBarbos

CONTRIBUTING.md

@@ -436,28 +436,24 @@ following criteria is met:
 * the upstream package was declared or appears to be unmaintained, and
   retaining the stubs causes maintenance issues in typeshed.
 
-If a package ships its own `py.typed` file, please follow these steps:
+Case 1: If a package ships its own `py.typed` file, please follow these steps:
 
-1. Open an issue with the earliest month of removal in the subject.
-2. A maintainer will add the
-   ["stubs: removal" label](https://github.com/python/typeshed/labels/%22stubs%3A%20removal%22).
-3. Open a PR that sets the `obsolete_since` field in the `METADATA.toml`
-   file to the first version of the package that shipped `py.typed`.
-4. After at least six months, open a PR to remove the stubs.
+1. Make sure **stubsabot** open a PR that sets the `obsolete_since` field in the
+   `METADATA.toml` file to the first version of the package that shipped `py.typed`.
+2. After at least six months, make sure **stubsabot** open a PR to remove the stubs.
 
-If third-party stubs should be removed for other reasons, please follow these
-steps:
+Case 2: If third-party stubs should be removed for other reasons, please follow
+these steps:
 
 1. Open an issue explaining why the stubs should be removed.
 2. A maintainer will add the
    ["stubs: removal" label](https://github.com/python/typeshed/labels/%22stubs%3A%20removal%22).
 3. Open a PR that sets the `no_longer_updated` field in the `METADATA.toml`
    file to `true`.
-4. When a new version of the package was automatically uploaded to PyPI
-   (which can take up to a day), open a PR to remove the stubs.
+4. When a new version of the package was automatically uploaded to PyPI (which
+   can take up to a day), make sure **stubsabot** open a PR to remove the stubs.
 
-Don't forget to make sure the library is not in the [`pyrightconfig.stricter.json`](./pyrightconfig.stricter.json)
-exclusion list. If feeling kindly, please update [mypy](https://github.com/python/mypy/blob/master/mypy/stubinfo.py)
+If feeling kindly, please update [mypy](https://github.com/python/mypy/blob/master/mypy/stubinfo.py)
 for any stub obsoletions or removals.
 
 ### Marking PRs as "deferred"