DOC: added more and updated links in cheat sheet

[OliEfr]

• tests added / passed
• Ensure all linting tests pass, see here for how to run them
• whatsnew entry

[jreback]

can you say what you changed here.

cc @Dr-Irv

[OliEfr]

I created this PR #39707 (which was essentially the same) and it was merged yesterday with master. However, I checked in pandas-dev:master and my changes don't appear there. The changes in the cheat sheet should look like this.

That is why I created another this PR which is essentially the same.

(I used to use a pullBot to stay up to date with master. I figured, that my changes might have been reversed by the pullbot?! Now I am not using a pullbot anymore.)

This is my first contribution to a larger OSS-Project and I am kind of confused by the automated tests. I am not sure how to fix the failing tests. Merging with master didn't help.

Sorry for confusion.

[Dr-Irv]

@jreback He added hyperlinks to the documentation from the cheat sheet. I compared the current and his changes, and it looks fine to me. Nice idea. I merged it in.

Thanks @OliEfr

[OliEfr]

Oh, thanks very much :) Happy to contribute!