git/Documentation/config/man.txt

man.viewer::
	Specify the programs that may be used to display help in the
	'man' format. See linkgit:git-help[1].

man.<tool>.cmd::
	Specify the command to invoke the specified man viewer. The
	specified command is evaluated in shell with the man page
	passed as an argument. (See linkgit:git-help[1].)

man.<tool>.path::
	Override the path for the given tool that may be used to
	display help in the 'man' format. See linkgit:git-help[1].