[TIMOB-12411/TIMOB-17711] Remove currentActivity and currentService getters from documentation

Details :
[TIMOB-17711](https://jira.appcelerator.org/browse/TIMOB-17711)
[TIMOB-12411](https://jira.appcelerator.org/browse/TIMOB-12411)
Remove the `description` note.  It's not a valid key for `deprecated` and it's not needed.  You already have the note.