[Python-Dev] PEP template file now available

I just pushed an update to PEP 12 which includes a complete PEP template file. You can see the file at https://github.com/python/peps/blob/main/pep-0012/pep-NNNN.rst and it is also embedded in PEP 12 at https://python.github.io/peps/pep-0012/#template (it will hit the official URL eventually).