docs: Fix a few typos

[timgates42]

There are small typos in:

• docs/conf.py
• docs/index.rst
• mandelbrot/multiprocessing/multi.py
• mandelbrot/parallelpython_cython_pure_python/parallelpython_cython_pure_python.py
• mandelbrot/parallelpython_pure_python/parallelpython_pure_python.py
• mandelbrot/parallelpython_pure_python/parallelpython_pure_python_using_ppserver.py

Fixes:

• Should read contiguous rather than continguous.
• Should read that rather than shat.
• Should read submitted rather than subbmited.
• Should read particularly rather than particuarly.
• Should read modifications rather than modificatoins.
• Should read exactly rather than exaclty.
• Should read comparison rather than comparision.
• Should read comparative rather than comparitive.
• Should read capabilities rather than capabilties.

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