NMS-6746: Improve readability SnmpMonitor

- Table for Operation mode reformatted in source
- Description table shortened
- Operator description added force line breaks
- Changed snmp-config.xml format as file
- Reformatted examples and the used OIDs
- Renamed the example service from All_Static_Routes to All-Static-Routes to look less like source code
'Seems like there's an extra space between "to" and "monitor"