REST API documentation does not reflect some actual endpoints

[didithilmy]

Motivation

Some REST endpoints path in the documentation differs from the actual API path. Several instances of this:

1. /rules endpoint, listed in the docs as /rule
2. /config endpoint, listed in the docs as /configs
3. /tmp_dids endpoint, listed in the docs as /temporary_dids
4. /accountlimits endpoint, listed in the docs as /accounts

Additionally, there are endpoints that exist in the source but lack the accompanying docs:

1. /credentials endpoint
2. /export endpoint
3. /import endpoint

Modification

Several files need to be edited/added:

• lib/rucio/web/rest/flaskapi/v1/{account_limit|config|rule|temporary_dids}.py need to be edited to change the doc_app.register_blueprint(bp, url_prefix='/<endpoint prefix>') portion.
• Add new .rst files