Document other endpoints

[synedra]

We have good documentation about the OAuth endpoints, including the request and the response.

https://fusionauth.io/docs/lifecycle/authenticate-users/oauth/endpoints

We should document our other relevant endpoints using the same format on pages with the path/title of 'endpoints', including the purpose of the endpoint, the request parameters and the response.

They should be added under the appropriate documentation category.

Here are endpoints we should document:

Under https://fusionauth.io/docs/lifecycle/manage-users/account-management/

the account endpoint

Note that this is a feature only available with a paid edition, so we should use the correct blurb.

Under https://fusionauth.io/docs/lifecycle/register-users/

the registration endpoint

Under https://fusionauth.io/docs/lifecycle/authenticate-users/saml

the SAML ACS and other endpoints

You'll want to break out https://fusionauth.io/docs/lifecycle/authenticate-users/saml#endpoints

Under OAuth

the OAuth2 callback (/oauth2/callback)

This is the callback if FusionAuth is a client (so if you are federating from one FusionAuth instance to another, this would be the redirect URL. See https://fusionauth.io/community/forum/topic/826/can-fusionauth-federate-to-itself/4 for more.)