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

docs/man/man3/ansible.lineinfile.3

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+.TH ANSIBLE.LINEINFILE 5 "2012-10-02" "0.8" "ANSIBLE MODULES"
+." generated from library/lineinfile
+.SH NAME
+lineinfile \- Ensure a particular line is in a file
+." ------ DESCRIPTION
+.SH DESCRIPTION
+.PP
+This module will search a file for a line, and ensure that it is present or absent. 
+.PP
+This is primarily useful when you want to change a single line in a file only. For other cases, see the \fIcopy\fR or \fItemplate\fR modules. 
+." ------ OPTIONS
+."
+."
+.SH OPTIONS
+
+.IP state
+Whether the line should be there or not.
+.IR Choices :
+present,absent. (default: present)
+.IP name
+The file to modify(required)
+.IP insertafter
+Used with \fCstate=present\fR. If specified, the line will be inserted after the specified regular expression. Two special values are available; \fCBOF\fR for inserting the line at the beginning of the file, and \fCEOF\fR for inserting the line at the end of the file.
+.IR Choices :
+BOF,EOF. (default: EOF)
+.IP regexp
+The regular expression to look for in the file. For \fCstate=present\fR, the pattern to replace. For \fCstate=absent\fR, the pattern of the line to remove.(required)
+.IP line
+Required for \fCstate=present\fR. The line to insert/replace into the file. Must match the value given to \fCregexp\fR.
+.IP backup
+Create a backup file including the timestamp information so you can get the original file back if you somehow clobbered it incorrectly.."
+."
+." ------ NOTES
+."
+."
+." ------ EXAMPLES
+.SH EXAMPLES
+.PP
+.nf
+lineinfile name=/etc/selinux/config regexp=^SELINUX= line=SELINUX=disabled
+.fi
+.PP
+.nf
+lineinfile name=/etc/sudoers state=absent regexp="^%wheel"
+.fi
+." ------- AUTHOR
+.SH AUTHOR
+Daniel Hokka Zakrisson
+.SH SEE ALSO
+.IR ansible (1),
+.I http://ansible.github.com/modules.html#lineinfile