NMS-6689: Documentation StrafePingMonitor

- Enhanced main description of StrafePing
- Added image as unedited raw image and commented graphic
- Added StrafePingMonitor to main document in index.adoc
- Minor format fixes
Merge pull request #1 from indigo423/NMS-6689-Docs-StrafePingMonitor

NMS-6689: Documentation StrafePingMonitor