Markdown-refdocs

BugFixes
- update parser to match changes to ast subscript parser in python3.9+ (see https://bugs.python.org/issue34822)

New Features
- 18: Support `Todo` blocks

BugFixes
- 15: Allow `examples` or `example` blocks

New Features
- Support multiple admonition types to output markdown style admonitions

BugFixes
- 11: cast type name to string before calculating links

BugFixes
- 8 Retain description lines after an empty line

New Features
- feat: support Callable annotations

BugFixes
- log warning on multiple returns in docstring instead of throwing error