Fixed documentation in playbooks_variables.rst

This fixes 8173, if target was not defined it would break, now it wont

Fix for issue #8152: Missing auth headers and a faulty JSON decode

Looks like this regressed in commit 97301575 due to fetch_url refactors.

Retr0h/align markdown headers

Enable puppet facts

A fairly trivial change since `Role Name` and `Example Playbook`
will likely be modified anyways.  However, since all the other
sections are aligned properly, felt it would be nice to "clean this up".

Before:

    Role Name
    ========

    Example Playbook
    -------------------------

After:

    Role Name
    =========

    Example Playbook
    ----------------

Currently facter facts omit facts that a distributed via Puppet. This
commit adds the `--puppet` option.

In cases where puppet is not installed, the command sends a warning to
STDERR *but* completes successfully. So should not cause any issues.

The benefit is, filtering can be done based on facts set by Puppet.

Update docs to mention new PPA

This reverts commit 7a8eb0b6.

Adds channel key parameter

Merge pull request #8166 from scottbrown/bugfix-ansible-vault-read-password-does-not-close-file-handle

Fixing improperly closed file handle in ansible vault

Fix EC2_TAG module output structure when listing tags

Fix "TypeError: group id must be integer" if groupid passed in for group key

portage: default exit (not fail) if sync=yes in check mode

Load existing group_vars file for new group_by group

if it was not loaded yet, which happens if that group
didn't exist yet in the inventory.

fixes #8159

Fixes #8128

Update lineinfile validate help

Added setting of the health_check options on an existing ASG

Fixing bug where the file handle is not closed properly because the parentheses are left off the call, telling Python to return a method but not call the method.

layman: remove my email address

fix get_distribution_version() on amazon linux

Correctly handle .repo files in zypper_repository module

Docs: fix the name of the package that provides apt-add-repository on Ubuntu