Minor edits to the documentation

[sosna]

Hey there,

First, thanks for your nice project :).

While reading the documentation, I found a few typos or missing punctuation, and thought you might want to receive a pull request for these.

Cheers,
Xavier

PS: I read the contributing.md, but it does not seem to apply to changes to the documentation?

[cyberw]

Nice! I almost couldnt believe we still had that many errors. Have a look at my comments and I’ll merge.

[sosna]

I almost couldnt believe we still had that many errors.

Well, as a user, I found the documentation to be clear and comprehensive :)

Have a look at my comments and I’ll merge.

I have made the requested changes but I wasn't entirely sure about the first one and so didn't resolve that conversation.

[sosna]

Done :)

[cyberw]

Thanks!!