improves godoc comments for gRPC server and logger components

pkg/srv/grpc/grpc.go

@@ -31,8 +31,9 @@ type appGRPCServer struct {
 	doneChan     chan error
 }
 
-// Returns a shutdown func, a channel indicating done / error,
-// and an up-front error if server fails to start
+// InitGRPCServer initializes and starts a gRPC server.
+// It returns a shutdown function, a channel to signal completion or error,
+// and an error if the server fails to start.
 func InitGRPCServer(ctx context.Context, opts *opts.GRPCOpts) (
 	func(context.Context) error, <-chan error, error,
 ) {