Update docs for dep.Ctx. Ctx.SetPaths and Ctx.DetectProjectGOPATH
Update docs for dep.Ctx. Ctx.SetPaths and Ctx.DetectProjectGOPATH

Signed-off-by: Ibrahim AshShohail <0929382f76e6f6d0c4342bd278d0f4e62a972ca3@gmail.com>

golang/dep,golang/dep,ibrasho-forks/dep,ibrasho-forks/dep,golang/dep