NMS-6732: Add more details to ImapMonitor

- Added doc how the monitor works internal based on the source
Merge pull request #57 from indigo423/NMS-6732-Add-more-details-ImapMonitor

NMS-6732: Add more details to ImapMonitor
Merge pull request #55 from StCyr/cyr-doc-update

NMS-6655: Initial revision of IcmpMonitor documentation
NMS-6733: Include IcmpMonitor in main doc

- Included in index.adoc in alphabetical order
- Removed forced line break in general description
- Minor format changes for better readability
Merge pull request #58 from indigo423/NMS-6733-Include-IcmpMonitor-in-main-doc

NMS-6733: Include IcmpMonitor in main doc