typing: add more type hints to the errors module...
typing: add more type hints to the errors module
These were found by looking for `Any` types in the generated `*.pyi` file after
running the tests. There are some more complicated types that I'm not sure of,
and am leaving untyped. I also can't figure out how to get `self.hint` to be
anything other than `Any` in most classes.
Differential Revision:
https://phab.mercurial-scm.org/D11719
