Library functions and modules should be in the 3 man page section. Also the files should end in '.3'

docs/man/man3/ansible.ping.3

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+.TH ANSIBLE.PING 5 "2012-10-02" "0.8" "ANSIBLE MODULES"
+." generated from library/ping
+.SH NAME
+ping \- Try to connect to host and return pong on success.
+." ------ DESCRIPTION
+.SH DESCRIPTION
+.PP
+A trivial test module, this module always returns 'pong' on successful contact. It does not make sense in playbooks, but is useful from \fC/usr/bin/ansible\fR 
+." ------ OPTIONS
+."
+."
+."
+."
+." ------ NOTES
+."
+."
+." ------ EXAMPLES
+.SH EXAMPLES
+.PP
+.nf
+ansible webservers -m ping
+.fi
+." ------- AUTHOR
+.SH AUTHOR
+Michael DeHaan
+.SH SEE ALSO
+.IR ansible (1),
+.I http://ansible.github.com/modules.html#ping