Document differences to "PEP: 622 Structural Pattern Matching Version"

[v217]

PEP: 622 proposes Structural Pattern Matching for python 3.10.
For some users it may be interesting how difficult it would be to port the pampy pattern matching code to native python 3.10 code.
(that is if pep 622 gets accepted)
I couldn't find any posts where differences and overlaps are documented.
Thank you for this great project!

[froh]

Whichever the response would be, 622 has been superseded by [635 motivation and rationale] (https://github.com/python/peps/blob/master/pep-0635.rst) and it's two companions 634 specification and 636 tutorial.