Clarify documentation

Signed-off-by: Maia Iyer <maia.raj.iyer@gmail.com>

Author: maia-iyer

a2a/slack_researcher/README.md

@@ -35,7 +35,7 @@ The Slack Researcher Agent is designed to perform research tasks across Slack ch
 > If `ISSUER` is additionally set, the `iss` claim will be checked to equal this value. 
 > If `AUDIENCE` is additionally set, the `aud` claim will be checked to equal this value. 
 > If all of `TOKEN_URL`, `CLIENT_ID`, and `CLIENT_SECRET` are set in addition, token exchange will be performed using Bearer tokens from incoming requests, to send to the MCP endpoint. 
-> In addition to `TOKEN_URL`, `CLIENT_ID`, `CLIENT_SECRET`, `TARGET_AUDIENCE` and `TARGET_SCOPES` can be optionally configured as the values of `audience` and `scope` in the token exchange request, respectively. 
+> In addition to `TOKEN_URL`, `CLIENT_ID`, `CLIENT_SECRET`, which trigger token exchange, `TARGET_AUDIENCE` and `TARGET_SCOPES` can be optionally configured as the values of `audience` and `scope` in the token exchange request, respectively. 
 
 
 ## Running in Kagenti

a2a/slack_researcher/slack_researcher/auth.py

@@ -133,7 +133,6 @@ async def exchange(self, subject_token: str, audience: str = None, scope: str =
             'client_secret': self.client_secret,
             'subject_token': subject_token,
         }
-        # TODO add audience, scope if populated
         if not audience is None:
             data['audience'] = audience
         if not scope is None: