There's a cleaner way to do this, commit to module formatter pending.

Revert "No longer need to reference 'version_added' in docs for these, as this was quite a while ago."

This reverts commit ff0a41d446.

library/system/authorized_key

@@ -27,7 +27,7 @@ module: authorized_key
 short_description: Adds or removes an SSH authorized key
 description:
      - Adds or removes an SSH authorized key for a user from a remote host.
-version_added: historical
+version_added: "0.5"
 options:
   user:
     description:

library/system/facter

@@ -28,7 +28,7 @@ description:
      - Runs the I(facter) discovery program
        (U(https://github.com/puppetlabs/facter)) on the remote system, returning
        JSON data that can be useful for inventory purposes.
-version_added: historical
+version_added: "0.2"
 options: {}
 notes: []
 requirements: [ "facter", "ruby-json" ]

library/system/group

@@ -22,7 +22,7 @@ DOCUMENTATION = '''
 ---
 module: group
 author: Stephen Fromm
-version_added: historical
+version_added: "0.0.2"
 short_description: Add or remove groups
 requirements: [ groupadd, groupdel, groupmod ]
 description:

library/system/mount

@@ -26,7 +26,7 @@ module: mount
 short_description: Control active and configured mount points
 description:
      - This module controls active and configured mount points in C(/etc/fstab).
-version_added: historical
+version_added: "0.6"
 options:
   name:
     description:

library/system/ohai

@@ -28,7 +28,7 @@ description:
        (U(http://wiki.opscode.com/display/chef/Ohai)) on the remote host and 
        returns JSON inventory data.
        I(Ohai) data is a bit more verbose and nested than I(facter).
-version_added: historical
+version_added: "0.6"
 options: {}
 notes: []
 requirements: [ "ohai" ]

library/system/user

@@ -22,7 +22,7 @@ DOCUMENTATION = '''
 ---
 module: user
 author: Stephen Fromm
-version_added: historical
+version_added: "0.2"
 short_description: Manage user accounts
 requirements: [ useradd, userdel, usermod ]
 description: