Update tox.ini

Author: emdneto

tox.ini

@@ -303,7 +303,7 @@ envlist =
     ; below mean these dependencies are being used:
     ; 0: grpcio==1.62.0
     ; 1: grpcio==1.75.1
-    ; TODO: simplify tests-requirements here to use latest|oldest testing pattern
+    ; TODO #4201 simplify tests-requirements here to use latest|oldest testing pattern
     py3{9,10,11,12}-test-instrumentation-grpc-{0,1}
     py3{13,14}-test-instrumentation-grpc-1
     lint-instrumentation-grpc