core/editor3: add documentation for canAnnotate
core/editor3: add documentation for canAnnotate

Change-Id: Ie6ac3305b807c61f774d8d7f42bc5021817dd3e3

pavlovicnemanja/superdesk-client-core,mdhaman/superdesk-client-core,mdhaman/superdesk-client-core,pavlovicnemanja/superdesk-client-core,petrjasek/superdesk-client-core,marwoodandrew/superdesk-client-core,gbbr/superdesk-client-core,Aca-jov/superdesk-client-core,petrjasek/superdesk-client-core,jerome-poisson/superdesk-client-core,ioanpocol/superdesk-client-core,ioanpocol/superdesk-client-core,jerome-poisson/superdesk-client-core,mdhaman/superdesk-client-core,superdesk/superdesk-client-core,superdesk/superdesk-client-core,Aca-jov/superdesk-client-core,mdhaman/superdesk-client-core,jerome-poisson/superdesk-client-core,gbbr/superdesk-client-core,Aca-jov/superdesk-client-core,mugurrus/superdesk-client-core,petrjasek/superdesk-client-core,mugurrus/superdesk-client-core,petrjasek/superdesk-client-core,mdhaman/superdesk-client-core,jerome-poisson/superdesk-client-core,ioanpocol/superdesk-client-core,marwoodandrew/superdesk-client-core,superdesk/superdesk-client-core,mugurrus/superdesk-client-core,gbbr/superdesk-client-core,pavlovicnemanja/superdesk-client-core,marwoodandrew/superdesk-client-core,gbbr/superdesk-client-core,marwoodandrew/superdesk-client-core,mugurrus/superdesk-client-core,pavlovicnemanja/superdesk-client-core,ioanpocol/superdesk-client-core,superdesk/superdesk-client-core,marwoodandrew/superdesk-client-core,Aca-jov/superdesk-client-core,jerome-poisson/superdesk-client-core,pavlovicnemanja/superdesk-client-core,petrjasek/superdesk-client-core,superdesk/superdesk-client-core,ioanpocol/superdesk-client-core