docs: Fix a few typos

[timgates42]

There are small typos in:

• README.rst
• reloader.py

Fixes:

• Should read interpreter rather than interpretter.
• Should read hierarchies rather than hierachies.

Semi-automated pull request generated by https://github.com/timgates42/meticulous/blob/master/docs/NOTE.md

[jparise]

Thanks!