docs: polish oidc docstrings

Agent-Logs-Url: https://github.com/AzureAD/microsoft-authentication-library-for-python/sessions/d56329c6-d8ad-4440-8617-3df24459fed0

Co-authored-by: bgavrilMS <12273384+bgavrilMS@users.noreply.github.com>

Author: Copilot

msal/oauth2cli/oidc.py

@@ -195,7 +195,7 @@ def obtain_token_by_auth_code_flow(self, auth_code_flow, auth_response, **kwargs
         """Validate the auth_response being redirected back, and then obtain tokens,
         including ID token which can be used for user sign in.
 
-        It also implements PKCE to mitigate the auth code interception attack.
+        It implements PKCE to mitigate the auth code interception attack.
 
         See :func:`oauth2.Client.obtain_token_by_auth_code_flow` in parent class
         for descriptions on other parameters and return value.
@@ -216,7 +216,7 @@ def obtain_token_by_browser(
             **kwargs):
         """A native app can use this method to obtain token via a local browser.
 
-        It also implements PKCE to mitigate the auth code interception attack.
+        It implements PKCE to mitigate the auth code interception attack.
 
         :param string display: Defined in
             `OIDC <https://openid.net/specs/openid-connect-core-1_0.html#AuthRequest>`_.