Don't add exception docs for NotNull out parameters
Don't add exception docs for NotNull out parameters

At some point we *may* want to automatically append something in the
parameter doc (to say that it won't be null on return) but that's
pretty low priority.

Fixes #1019.

BenJenkinson/nodatime,nodatime/nodatime,jskeet/nodatime,nodatime/nodatime,jskeet/nodatime,malcolmr/nodatime,malcolmr/nodatime,malcolmr/nodatime,BenJenkinson/nodatime,malcolmr/nodatime