Backport clean cherry-picks of
9c39f8515f
and
c7a21cbb0c
onto 1.21.
- Use maintained fork https://github.com/golangci/misspell
- Rename `mispell-check` to `lint-spell`, add `lint-spell-fix`
- Run `lint-spell` in separate actions step
- Lint more files, fix discovered issues
- Remove inaccurate and outdated info in docs (we do not need GOPATH for
tools anymore)
Maybe later we can add more spellchecking tools, but I have not found
any good ones yet.
8cd83ff391