* Move the "Mistaken rejection" section up to Overview.
* Stipulate that the exact value of strings returned by SOURCE
format may change in the future.
* Disallow walrus and generator operators in annotation expressions.
* PEP 649: fix backticks
* PEP 649: fix typos
* PEP 649: update formatting
* PEP 649: update formatting
* PEP 649: remove redundant emacs metadata
* PEP 649: use more roles
Changes detected by Topy (https://github.com/intgr/topy), all changes
verified by hand, false positives have been omitted.
These range from straight-out misspellings to debatable hyphen placement.
The hyphen changes are supported by grammar manuals of style.