Updating SELinux example doc in lininefile module

Encouraging users to use this Ansible module to enable SELinux seems
like a better idea. It also warms Dan Walsh's heart.

Signed-off-by: Major Hayden <major@mhtx.net>

lib/ansible/modules/files/lineinfile.py

@@ -127,7 +127,7 @@ options:
 """
 
 EXAMPLES = r"""
-- lineinfile: dest=/etc/selinux/config regexp=^SELINUX= line=SELINUX=disabled
+- lineinfile: dest=/etc/selinux/config regexp=^SELINUX= line=SELINUX=enforcing
 
 - lineinfile: dest=/etc/sudoers state=absent regexp="^%wheel"