ENH: Another link

Author: larsoner

docs/maintainer/knowledge_base.md

@@ -1719,7 +1719,7 @@ add some information on r packages which make heavy use of `noarch: generic`
 
 #### Noarch packages with abi3 extensions
 
-It is not currently officially supported to build packages using CPython's stable [`abi3` mode](https://docs.python.org/3/c-api/stable.html), but support is being tracked in [conda-forge/conda-forge.github.io#1865](https://github.com/conda-forge/conda-forge.github.io/issues/1865).
+It is not currently officially supported to build packages using CPython's stable [`abi3` mode](https://docs.python.org/3/c-api/stable.html), but support is being tracked in [conda-forge/conda-forge.github.io#1865](https://github.com/conda-forge/conda-forge.github.io/issues/1865) and [CEP 20](https://github.com/conda/ceps/blob/main/cep-0020.md).
 
 ## Multi-output recipes