Fix gRPC to call credentials.before_request (#116)
diff --git a/google/auth/credentials.py b/google/auth/credentials.py
index 2358b1d..8570957 100644
--- a/google/auth/credentials.py
+++ b/google/auth/credentials.py
@@ -104,8 +104,9 @@
Args:
request (google.auth.transport.Request): The object used to make
HTTP requests.
- method (str): The request's HTTP method.
- url (str): The request's URI.
+ method (str): The request's HTTP method or the RPC method being
+ invoked.
+ url (str): The request's URI or the RPC service's URI.
headers (Mapping): The request's headers.
"""
# pylint: disable=unused-argument