Add doc example for lineinfile without a regexp parameter

library/files/lineinfile

@@ -131,6 +131,9 @@ EXAMPLES = r"""
 
 - lineinfile: dest=/etc/services regexp="^# port for http" insertbefore="^www.*80/tcp" line="# port for http by default"
 
+# Add a line to a file if it does not exist, without passing regexp
+- lineinfile: dest=/tmp/testfile line="192.168.1.99 foo.lab.net foo"
+
 # Fully quoted because of the ': ' on the line. See the Gotchas in the YAML docs.
 - lineinfile: "dest=/etc/sudoers state=present regexp='^%wheel' line='%wheel ALL=(ALL) NOPASSWD: ALL'"