Improve API docs for DAC and CTC (Azure#37904)

Author: scottaddie

sdk/identity/azure-identity/azure/identity/_credentials/chained.py

@@ -37,8 +37,8 @@ class ChainedTokenCredential:
     """A sequence of credentials that is itself a credential.
 
     Its :func:`get_token` method calls ``get_token`` on each credential in the sequence, in order, returning the first
-    valid token received. For more information, see
-    https://aka.ms/azsdk/python/identity/credential-chains#chainedtokencredential-overview.
+    valid token received. For more information, see `ChainedTokenCredential overview
+    <"https://aka.ms/azsdk/python/identity/credential-chains#chainedtokencredential-overview">`__.
 
     :param credentials: credential instances to form the chain
     :type credentials: ~azure.core.credentials.TokenCredential

sdk/identity/azure-identity/azure/identity/_credentials/default.py

@@ -24,8 +24,9 @@
 
 
 class DefaultAzureCredential(ChainedTokenCredential):
-    """A credential capable of handling most Azure SDK authentication scenarios. See
-    https://aka.ms/azsdk/python/identity/credential-chains#usage-guidance-for-defaultazurecredential.
+    """A credential capable of handling most Azure SDK authentication scenarios. For more information, See
+    `Usage guidance for DefaultAzureCredential
+    <"https://aka.ms/azsdk/python/identity/credential-chains#usage-guidance-for-defaultazurecredential">`__.
 
     The identity it uses depends on the environment. When an access token is needed, it requests one using these
     identities in turn, stopping when one provides a token: