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

docs/man/man3/ansible.apt_repository.3

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+.TH ANSIBLE.APT_REPOSITORY 5 "2012-10-02" "0.8" "ANSIBLE MODULES"
+." generated from library/apt_repository
+.SH NAME
+apt_repository \- Manages apt repositores
+." ------ DESCRIPTION
+.SH DESCRIPTION
+.PP
+Manages apt repositores (such as for Debian/Ubuntu). 
+." ------ OPTIONS
+."
+."
+.SH OPTIONS
+
+.IP repo
+The repository name/value(required)
+.IP state
+The repository state
+.IR Choices :
+present,absent. (default: present)."
+."
+." ------ NOTES
+.SH NOTES
+.PP
+This module works on Debian and Ubuntu only and requires \fCapt-add-repository\fR be available on destination server. To ensure this package is available use the \fCapt\fR module and install the \fCpython-software-properties\fR package before using this module. 
+.PP
+A bug in \fCapt-add-repository\fR always adds \fCdeb\fR and \fCdeb-src\fR types for repositories (see the issue on Launchpad \fIhttps://bugs.launchpad.net/ubuntu/+source/software-properties/+bug/987264\fR), if a repo doesn't have source information (eg MongoDB repo from 10gen) the system will fail while updating repositories. 
+."
+."
+." ------ EXAMPLES
+.SH EXAMPLES
+.PP
+.nf
+apt_repository repo=ppa://nginx/stable
+.fi
+.PP
+.nf
+apt_repository repo='deb http://archive.canonical.com/ubuntu hardy partner'
+.fi
+." ------- AUTHOR
+.SH AUTHOR
+Matt Wright
+.SH SEE ALSO
+.IR ansible (1),
+.I http://ansible.github.com/modules.html#apt-repository