Grammar improvements

This is a handful of grammar improvements and some brief documentation of the `check` syntax (which is why I was digging around the code in the first place).

I really like using eye, thanks for the nice tool.

Random sidenote: I couldn't get all the specs working, but it seems unrelated to my changes (these ones are failing in master for me):

```
rspec ./spec/process/triggers/transition_spec.rb:152 # Trigger Transition Kill process childs when process crashed or stop when process crashed it should kill all chils too
rspec ./spec/controller/stop_on_delete_spec.rb:48 # StopOnDelete behaviour delete application => stop all proceses
rspec ./spec/process/triggers/stop_childs_spec.rb:31 # StopChilds State when process crashed it should kill all chils too
```