state/multiwatcher: added many missing doc comments
state/multiwatcher: added many missing doc comments

mhilton/juju,bz2/juju,gabriel-samfira/juju,anastasiamac/juju,tsakas/juju,frankban/juju,fwereade/juju,alesstimec/juju,marcmolla/juju,dooferlad/juju,dimitern/juju,reedobrien/juju,tsakas/juju,waigani/juju,bac/juju,kat-co/juju,mjs/juju,tsakas/juju,cloud-green/juju,kat-co/juju,bogdanteleaga/juju,reedobrien/juju,kat-co/juju,makyo/juju,makyo/juju,mikemccracken/juju,voidspace/juju,bz2/juju,fwereade/juju,AdamIsrael/juju,bz2/juju,cloud-green/juju,mikemccracken/juju,mhilton/juju,macgreagoir/juju,alesstimec/juju,thomnico/juju,kat-co/juju,axw/juju,mhilton/juju,dimitern/juju,howbazaar/juju,howbazaar/juju,kat-co/juju,frankban/juju,mhilton/juju-juju,reedobrien/juju,mjs/juju,Altoros/juju-cloudsigma,tsakas/juju,dooferlad/juju,axw/juju,marcmolla/juju,macgreagoir/juju,howbazaar/juju,mhilton/juju,bogdanteleaga/juju,frankban/juju,waigani/juju,cloud-green/juju,AdamIsrael/juju,mjs/juju,reedobrien/juju,wwitzel3/juju,bz2/juju,dooferlad/juju,thomnico/juju,mhilton/juju-juju,wwitzel3/juju,voidspace/juju,bac/juju,perrito666/juju,mjs/juju,axw/juju,dooferlad/juju,gabriel-samfira/juju,ericsnowcurrently/juju,makyo/juju,mjs/juju,mjs/juju,ericsnowcurrently/juju,bogdanteleaga/juju,dimitern/juju,axw/juju,dimitern/juju,thomnico/juju,bac/juju,perrito666/juju,howbazaar/juju,Altoros/juju-cloudsigma,davecheney/juju,davecheney/juju,perrito666/juju,mikemccracken/juju,makyo/juju,gabriel-samfira/juju,wwitzel3/juju,AdamIsrael/juju,frankban/juju,ericsnowcurrently/juju,mikemccracken/juju,davecheney/juju,anastasiamac/juju,voidspace/juju,waigani/juju,voidspace/juju,alesstimec/juju,gabriel-samfira/juju,gabriel-samfira/juju,cloud-green/juju,davecheney/juju,mhilton/juju-juju,alesstimec/juju,anastasiamac/juju,fwereade/juju,macgreagoir/juju,bz2/juju,wwitzel3/juju,alesstimec/juju,mhilton/juju-juju,bac/juju,AdamIsrael/juju,mikemccracken/juju,marcmolla/juju,frankban/juju,bogdanteleaga/juju,reedobrien/juju,dooferlad/juju,axw/juju,thomnico/juju,macgreagoir/juju,perrito666/juju,anastasiamac/juju,bac/juju,Altoros/juju-cloudsigma,fwereade/juju,howbazaar/juju,macgreagoir/juju,ericsnowcurrently/juju,anastasiamac/juju,waigani/juju,marcmolla/juju,marcmolla/juju,perrito666/juju,mjs/juju,ericsnowcurrently/juju,Altoros/juju-cloudsigma,dimitern/juju