documentation bits for "letting domain" and -->

[N-J-Martin]

I think there's is still some left overs, but seems to be more synced this time.

[ozgurakgun]

I'll merge this one. For future PRs, it's better if you can do the following:

• sync your fork's main branch (see screenshot from my fork)
• make a new branch on your for (git checkout -b NEWBRANCH)
• push commits to NEWBRANCH on your fork
• create a PR from NEWBRANCH to conjure-cp/conjure's main (github should ask you if you want to do this in various places)

Thanks for the contributions!