Update, simplify and cleanup
Update, simplify and cleanup

- Simplify, and hopefully clarify, leading paragraph
- Fix Markdown formatting buglets
- Mention watchdogctl more

Signed-off-by: Joachim Nilsson <583c295fd7602c168ad814279bbc3894ba65f5d6@gmail.com>

troglobit/watchdogd,troglobit/watchdogd