update comment

Author: taegyunkim

ddtrace/internal/datadog/profiling/code_provenance.py

@@ -104,7 +104,9 @@ def to_dict(self) -> t.Dict[str, t.Any]:
 
 
 # Initialize once at import to avoid reinitializing this in every child process.
-# This can add up and show up as a significant overhead.
+# This can add up and show up as a significant overhead, especially in a service
+# with many packages installed, and many short lived child processes serving
+# requests.
 CODE_PROVENANCE_JSON_STR = json.dumps(CodeProvenance().to_dict())