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

docs/man/man3/ansible.yum.3

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+.TH ANSIBLE.YUM 5 "2012-10-02" "0.8" "ANSIBLE MODULES"
+." generated from library/yum
+.SH NAME
+yum \- Manages packages with the I(yum) package manager
+." ------ DESCRIPTION
+.SH DESCRIPTION
+.PP
+Will install, upgrade, remove, and list packages with the \fIyum\fR package manager. 
+." ------ OPTIONS
+."
+."
+.SH OPTIONS
+
+.IP state
+whether to install (\fCpresent\fR, \fClatest\fR), or remove (\fCabsent\fR) a package.
+.IR Choices :
+present,latest,absent. (default: present)
+.IP list
+various non-idempotent commands for usage with \fC/usr/bin/ansible\fR and \fInot\fR playbooks. See examples.
+.IP name
+package name, or package specifier with version, like \fCname-1.0\fR.(required)."
+."
+." ------ NOTES
+."
+."
+." ------ EXAMPLES
+.SH EXAMPLES
+.PP
+.nf
+yum name=httpd state=latest
+.fi
+.PP
+.nf
+yum name=httpd state=removed
+.fi
+.PP
+.nf
+yum name=httpd state=installed
+.fi
+." ------- AUTHOR
+.SH AUTHOR
+Seth Vidal
+.SH SEE ALSO
+.IR ansible (1),
+.I http://ansible.github.com/modules.html#yum