Add missing docs

[jgosmann]

Motivation and context:
This add some things that were missing in the docs, also see #228

Interactions with other PRs:
none

How has this been tested?
build and looked at the documentation

How long should this take to review?

• Quick (less than 40 lines changed or changes are straightforward)

Types of changes:

• Non-code change (touches things like tests, documentation, build scripts)

Checklist:

• I have read the CONTRIBUTING.rst document.
• I have updated the documentation accordingly.
• I have included a changelog entry.
• [n/a] I have added tests to cover my changes.
• [n/a] I have run the test suite locally and all tests passed.

[jgosmann]

@tbekolay I don't have permissions to merge PRs. 😢

[tbekolay]

I thought I gave you access :( I'll fix shortly once I'm at a computer

…

On Mon, Jun 10, 2019, 13:43 Jan Gosmann ***@***.***> wrote: @tbekolay <https://github.com/tbekolay> I don't have permissions to merge PRs. 😢 — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#229?email_source=notifications&email_token=AABRXPI2YOB7XPZV3WVXKCTPZ2HFXA5CNFSM4HWRIDP2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODXKTA5I#issuecomment-500510837>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AABRXPIFHXSVQPHM67XPFDLPZ2HFXANCNFSM4HWRIDPQ> .

[tbekolay]

The issue was a branch protection setting, you should be able to merge now