gh-95205: Improve WASM README.md (GH-95267) (GH-95270)

Co-authored-by: Erlend Egeberg Aasland <erlend.aasland@protonmail.com>
(cherry picked from commit e8f3e8f0ab8aa5d667229ce9694e6e1477e524fd)

Co-authored-by: Christian Heimes <christian@python.org>
2 files changed