[PagerDuty] Clarify account association between HipChat and PagerDuty.
[PagerDuty] Clarify account association between HipChat and PagerDuty.

Also mention, that a full acces API key is required.

pcurry/will,mike-love/will,jacobbridges/will,brandonsturgeon/will,Ironykins/will,mvanbaak/will,Regner/will,wontonst/will,fredsmith/will,chillipeper/will,brandonsturgeon/will,grahamhayes/will,ammartins/will,grahamhayes/will,pcurry/will,grahamhayes/will,chillipeper/will,Regner/will,ammartins/will,mike-love/will,dmuntean/will,skoczen/will,fredsmith/will,chillipeper/will,skoczen/will,dmuntean/will,shadow7412/will,wontonst/will,Ironykins/will,woohgit/will,skoczen/will,jacobbridges/will,mvanbaak/will,dmuntean/will,ammartins/will,woohgit/will,wontonst/will,pcurry/will,jacobbridges/will,mvanbaak/will,brandonsturgeon/will,woohgit/will,mike-love/will,shadow7412/will,shadow7412/will,Regner/will,fredsmith/will,Ironykins/will