Update intro_configuration.rst

Removed duplicate word "processed"
Fully clean 'ssh_old' and 'paramiko_alt' options

These transports have been removed in 33857855ad6d358d56d5fe60bd49be653b247e0b
Typo in rabbitmq_plugin docs

Should be "plugins", not "users".
Use the no-user-groups option (-N) for useradd in the user module

If no group was specified, but a group by the same name as the user
exists, an error was raised in the situation where USERGROUPS_ENAB is
enabled in /etc/login.defs (which is the case for almost every major
linux distro). In this case, the user will be put in group 100 (which
is usually the "users" group on those same distros). This is currently
only done in the base class, as the issue may not exist on other
platforms like AIX or the BSDs.

Fixes #6210
Support ssh-ed25519 keys

The newest version of OpenSSH supports a new, wonderful key type. authorized_key incorrectly discards pubkeys of this type as busted because it doesn't recognize type signature.
Merge pull request #6223 from lvh/patch-2

Support ssh-ed25519 keys
Merge pull request #6222 from csinchok/patch-1

Typo in rabbitmq_plugin docs
Merge pull request #6224 from gildegoma/runner-connection-cleanup

Fully delete 'ssh_old' and 'paramiko_alt' options
Merge pull request #6076 from wshaddix/patch-1

Update intro_configuration.rst
Handle empty results from failed connections in _remote_md5()

Fixes #5800
Trim references to fireball as we want folks using accelerate or pipelining options.  Fireball is pretty well deprecated at this point, but will still be part of the release.
Since the ec2 parameter is named 'key_name' and 'keypair' is just an alias, use
the primary name of the parameter in the examples.
Simplify file module parameter description.
Make the npm production parameter in the docs list the choices.
Show more whitespace throughout playbook examples to encourage better standards in first playbooks folks write.
Release codename placeholder :)