Fix docstring

requirements/sync-direct-runtime-deps.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-"""Sync direct runtime dependencies from setup.cfg to runtime-deps.in."""
+"""Sync direct runtime dependencies from pyproject.toml to runtime-deps.in."""
 
 import sys
 from pathlib import Path
@@ -17,6 +17,6 @@
 reqs = sorted(reqs, key=str.casefold)
 
 with open(Path("requirements", "runtime-deps.in"), "w") as outfile:
-    header = "# Extracted from `setup.cfg` via `make sync-direct-runtime-deps`\n\n"
+    header = "# Extracted from `pyproject.toml` via `make sync-direct-runtime-deps`\n\n"
     outfile.write(header)
     outfile.write("\n".join(reqs) + "\n")