Amtool comes with the option to create a number of ease-of-use artifacts that can be created.
A bash completion script can be generated by calling amtool --completion-script-bash.
The bash completion file can be added to /etc/bash_completion.d/.
A man page can be generated by calling amtool --help-man.
Man pages can be added to the man directory of your choice
amtool --help-man > /usr/local/share/man/man1/amtool.1
sudo mandb
Then you should be able to view the man pages as expected.