docs: fix a few simple typos

[jakeret]

There are small typos in:

• hope/_generator.py
• hope/_transformer.py
• hope/_wrapper.py
• hope/config.py
• hope/jit.py
• hope/options.py

Fixes:

• Should read unnecessary rather than unneccesary.
• Should read simplify rather than simpify.
• Should read returns rather than retuns.
• Should read reasonable rather than reasonamble.
• Should read purpose rather than purpos.
• Should read propagated rather than propageted.
• Should read problem rather than proplem.
• Should read multiplications rather than multipications.

Closes #58