(generate_summary_output): Fixed a typo in the generated comment.

doc/checkargs.py

@@ -2047,7 +2047,7 @@ def generate_summary_output(filename):
     fp.write("# by checkargs.py.  This file contains the definitions\n")
     fp.write("# of the types, requests and asynchronous messages in a\n")
     fp.write("# format that is intended to be both machine-readable and\n")
-    fp.write("# human-readable.  The requess may be renamed in the future.\n")
+    fp.write("# human-readable.  The requests may be renamed in the future.\n")
     fp.write("\n")
     fp.write("# This file is Copyright (C) 1995-2003 Lysator ACS.\n")
     fp.write("# All rights reserved.  This file may only be used\n")