go.tools/go/types: comment fixes - no code changes
go.tools/go/types: comment fixes - no code changes

TBR=adonovan

TBR=adonovan
R=adonovan
CC=golang-codereviews
https://codereview.appspot.com/80430045

karmakaze/go.tools,karmakaze/go.tools,chenjianlong/go.tools,karmakaze/go.tools,karmakaze/go.tools,chenjianlong/go.tools,chenjianlong/go.tools,karmakaze/go.tools