fix typos and grammar

[ThomasWaldmann]

No description provided.

[ThomasWaldmann]

These changes were done by Junie AI and reviewed by me locally.

[ThomasWaldmann]

One thing i noticed: under .githubs/worksflows/, we have *.yml and *.yaml.

[dpgeorge]

Looks reasonable to me.

Note that we use codespell in the main repo, as part of CI. It's good, but it doesn't catch everything.

[wnienhaus]

Looks good to me.
Re: .yml vs .yaml - it seems there is no "better" one, either will do. Looking at the GitHub Actions documentation, all their examples use .yml (even though the article starts by saying it doesnt matter). I could not find which of the two is more common overall.
So let's pick one of the two (personally I like .yaml). As I understand it, renaming should have no (negative) effect. Actions should continue working the same.

[ThomasWaldmann]

Guess a separate PR for the yaml is better, didn't fit into this.