Remove trailing space.

include/grpc/impl/codegen/grpc_types.h

@@ -307,7 +307,7 @@ typedef enum {
   GRPC_OP_RECV_STATUS_ON_CLIENT,
   /** Receive close on the server: one and only one must be made on the
       server.
-      This op completes after the close has been received by the server. 
+      This op completes after the close has been received by the server.
       This operation always succeeds, meaning ops paired with this operation
       will also appear to succeed, even though they may not have. */
   GRPC_OP_RECV_CLOSE_ON_SERVER