5fef4d4572
## Summary There is a new official URL for the typing documentation: https://typing.python.org/ Change all https://typing.readthedocs.io/ links to use the new sub domain, which is slightly shorter and looks more official. ## Test Plan Tested to see if each and every new URL is accessible. I noticed that some links go to https://typing.python.org/en/latest/source/stubs.html which seems to be outdated, but that is a separate issue. The same page shows up for the old URL.
Markdown files within the mdtest/ subdirectory are tests of type inference and type checking;
executed by the tests/mdtest.rs integration test.
See crates/red_knot_test/README.md for documentation of this test format.