updated help message with 'raw data' to 'raw messages data

Author: DanielMwendwa

mno_analysis_tools/compute_window_of_downtime.py

@@ -16,7 +16,7 @@
     parser.add_argument("raw_messages_file_path", metavar="input-file",
                         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.")
+                        help="File to write the raw messages data downloaded as jSON.")
     parser.add_argument("target_operator", metavar="operator",
                         help="Operator to analyze for downtime")
     parser.add_argument("target_message_direction", metavar="direction-of-message", choices=('in', 'out'),