Go has a simple but very effective "flag" package that can be used to quickly create CLI applications without any additional dependencies. But this package cannot generate man pages.
gohelp2man takes inspiration from GNU help2man, and generates a man page from the -help output of your Go program. It is specifically designed to recognise the help message generated by the "flag" package.
It is a great match with "go get -tool" and "go generate"!