Swap words on parser help message for clarity

Co-Authored-By: Isaack Mwenda <[email protected]>

Author: DanielMwendwa

mno_analysis_tools/compute_window_of_downtime.py

@@ -14,7 +14,7 @@
     parser = argparse.ArgumentParser(
         description="Compute maximum window of time with 0 messages")
     parser.add_argument("raw_messages_file_path", metavar="input-file",
-                        help="File to read the raw data downloaded as json")
+                        help="File to read the raw messages data downloaded as JSON")
     parser.add_argument("window_of_downtimes_output_file_path", metavar="output-file",
                         help="File to write the raw data downloaded as json.")
     parser.add_argument("target_operator", metavar="operator",