Documentation improvements

[szemek]

When I run bundle exec rake documentation I got warnings

[warn]: @param tag has unknown parameter name: q
    in file `lib/auth0/api/v2/logs.rb' near line 24
[warn]: @param tag has unknown parameter name: page
    in file `lib/auth0/api/v2/logs.rb' near line 24
[warn]: @param tag has unknown parameter name: per_page
    in file `lib/auth0/api/v2/logs.rb' near line 24
[warn]: @param tag has unknown parameter name: sort
    in file `lib/auth0/api/v2/logs.rb' near line 24
[warn]: @param tag has unknown parameter name: fields
    in file `lib/auth0/api/v2/logs.rb' near line 24
[warn]: @param tag has unknown parameter name: include_fields
    in file `lib/auth0/api/v2/logs.rb' near line 24
[warn]: @param tag has unknown parameter name: include_totals
    in file `lib/auth0/api/v2/logs.rb' near line 24
[warn]: @param tag has unknown parameter name: from
    in file `lib/auth0/api/v2/logs.rb' near line 24
[warn]: @param tag has unknown parameter name: take
    in file `lib/auth0/api/v2/logs.rb' near line 24
[warn]: @param tag has unknown parameter name: id
    in file `lib/auth0/api/v2/logs.rb' near line 51
[warn]: @param tag has unknown parameter name: connection
    in file `lib/auth0/api/v2/users.rb' near line 48
[warn]: @param tag has unknown parameter name: per_page
    in file `lib/auth0/api/v2/users.rb' near line 166
[warn]: @param tag has unknown parameter name: page
    in file `lib/auth0/api/v2/users.rb' near line 166
[warn]: @param tag has unknown parameter name: include_totals
    in file `lib/auth0/api/v2/users.rb' near line 166
[warn]: @param tag has unknown parameter name: sort
    in file `lib/auth0/api/v2/users.rb' near line 166
[warn]: @param tag has unknown parameter name: client_id
    in file `lib/auth0/api/v2/client_grants.rb' near line 35
[warn]: @param tag has unknown parameter name: client_id
    in file `lib/auth0/api/v2/client_grants.rb' near line 45
[warn]: @param tag has unknown parameter name: fields
    in file `lib/auth0/api/v2/users_by_email.rb' near line 16
[warn]: @param tag has unknown parameter name: include_fields
    in file `lib/auth0/api/v2/users_by_email.rb' near line 16
[warn]: @param tag has unknown parameter name: name
    in file `lib/auth0/api/v2/resource_servers.rb' near line 33
[warn]: @param tag has unknown parameter name: signing_alg
    in file `lib/auth0/api/v2/resource_servers.rb' near line 33
[warn]: @param tag has unknown parameter name: signing_secret
    in file `lib/auth0/api/v2/resource_servers.rb' near line 33
[warn]: @param tag has unknown parameter name: token_lifetime
    in file `lib/auth0/api/v2/resource_servers.rb' near line 33
[warn]: @param tag has unknown parameter name: scopes
    in file `lib/auth0/api/v2/resource_servers.rb' near line 33
[warn]: @param tag has unknown parameter name: fields
    in file `lib/auth0/api/v2/device_credentials.rb' near line 18
[warn]: @param tag has unknown parameter name: include_fields
    in file `lib/auth0/api/v2/device_credentials.rb' near line 18
[warn]: @param tag has unknown parameter name: user_id
    in file `lib/auth0/api/v2/device_credentials.rb' near line 18
[warn]: @param tag has unknown parameter name: type
    in file `lib/auth0/api/v2/device_credentials.rb' near line 18
[warn]: In file `lib/auth0/api/authentication_endpoints.rb':7: Cannot resolve link to @domain from text:
	...{@domain}...
[warn]: In file `lib/auth0/api/authentication_endpoints.rb':7: Cannot resolve link to @domain from text:
	...{@domain}...
[warn]: In file `lib/auth0/api/authentication_endpoints.rb':13: Cannot resolve link to @domain from text:
	...{@domain}...
[warn]: In file `lib/auth0/api/authentication_endpoints.rb':13: Cannot resolve link to @domain from text:
	...{@domain}...

In most cases param was inside of options hash, so I changed structure a bit and put all those hash keys under unordered list.
For example, #users(options = {}) ⇒ json instead of:

looks like this:

[joshcanhelp]

LGTM, thank you!