client_credential has its link in RTD now. Finally.

msal/application.py

@@ -210,7 +210,7 @@ def __init__(
 
         :param str client_id: Your app has a client_id after you register it on Microsoft Entra admin center.
 
-        :param Union[str, dict] client_credential:
+        :param client_credential:
             For :class:`PublicClientApplication`, you use `None` here.
             For :class:`ConfidentialClientApplication`,
             it can be a string containing client secret,
@@ -254,6 +254,8 @@ def __init__(
                     "client_assertion": "...a JWT with claims aud, exp, iss, jti, nbf, and sub..."
                 }
 
+        :type client_credential: Union[dict, str]
+
         :param dict client_claims:
             *Added in version 0.5.0*:
             It is a dictionary of extra claims that would be signed by