Update/Improve OAuth2 Client documentation
What does this MR do?
Improves the OAuth2 client documentation to include security hints to help people create secure clients.
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
I noticed the docs didn't mention some important points and steps, this cleans that up.
What are the relevant issue numbers?
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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CHANGELOG entry added -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the style guides -
Branch has no merge conflicts with master
(if you do - rebase it please) -
Squashed related commits together