docs: give examples of other authorization parameters (#382)

Co-authored-by: Marc-Aurèle DARCHE <madarche@users.noreply.github.com>
Co-authored-by: Filip Skokan <panva.ip@gmail.com>

docs/README.md

@@ -242,7 +242,7 @@ parameters.
   - `response_type`: `<string>` **Default:** If only a single `client.response_types` member is
     present that one will be used automatically.
   - `scope`: `<string>` **Default:** 'openid'
-  - any other authorization parameters may be provided
+  - any other authorization parameters may be provided (e.g. `nonce`, `state`, `login_hint`, ...)
 - Returns: `<string>`
 
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