Improve formatting of class documentation (#727)
Improve formatting of class documentation (#727)

And actor and primitive. Now matches more in format
to new method documentation format.
mkfifo/ponyc,Praetonus/ponyc,cquinn/ponyc,boemmels/ponyc,sgebbie/ponyc,lukecheeseman/ponyta,ryanai3/ponyc,doublec/ponyc,boemmels/ponyc,kulibali/ponyc,boemmels/ponyc,Perelandric/ponyc,doublec/ponyc,ponylang/ponyc,kulibali/ponyc,jemc/ponyc,sgebbie/ponyc,Theodus/ponyc,Praetonus/ponyc,doublec/ponyc,malthe/ponyc,ryanai3/ponyc,malthe/ponyc,mkfifo/ponyc,Perelandric/ponyc,jupvfranco/ponyc,lukecheeseman/ponyta,sgebbie/ponyc,Theodus/ponyc,dipinhora/ponyc,dipinhora/ponyc,CausalityLtd/ponyc,kulibali/ponyc,ponylang/ponyc,jupvfranco/ponyc,Perelandric/ponyc,jemc/ponyc,malthe/ponyc,CausalityLtd/ponyc,cquinn/ponyc,Perelandric/ponyc,dipinhora/ponyc,Theodus/ponyc,jemc/ponyc,jupvfranco/ponyc,cquinn/ponyc,CausalityLtd/ponyc,jupvfranco/ponyc,Theodus/ponyc,Praetonus/ponyc,mkfifo/ponyc,cquinn/ponyc,lukecheeseman/ponyta,ryanai3/ponyc,malthe/ponyc,Theodus/ponyc,sgebbie/ponyc,mkfifo/ponyc,ponylang/ponyc,boemmels/ponyc,sgebbie/ponyc,Perelandric/ponyc,kulibali/ponyc,Praetonus/ponyc,mkfifo/ponyc,boemmels/ponyc,jupvfranco/ponyc