docs: Change comment on how to activate go instrumentation

Author: therealjsie

charts/opentelemetry-operator/values.yaml

@@ -66,7 +66,7 @@ manager:
       repository: ""
       tag: ""
     # The Go instrumentation support in the operator is disabled by default.
-    # To enable it, use the operator.autoinstrumentation.go feature gate.
+    # To enable it, set manager.extraArgs[0] to "--enable-go-instrumentation"
     go:
       repository: ""
       tag: ""