Results 3 issues of maynouf

This PR fixes the documentation on the error reported in issue #209 A year ago [I posted a fix for the error](https://github.com/jamiebull1/geomeppy/issues/209#issuecomment-1103686087), but didn't submit any PRs (my bad). >...

I was having the error which is mentioned in issue #264 : `ImportError: cannot import name 'MutableSequence' from 'collections'` According to [this StackOverflow answer](https://stackoverflow.com/a/70870087/18211609): > You need to import collections.abc...

Hello, First to all, thank you all for your excellent and useful work. I am unaware of the proper GitHub etiquette regarding these questions, but without wanting to sound demanding...