rst.j2 template better core module source wording

Remove the call to preprocess_loop data from playbook_include as
includes can't be used with loops.

Doc: use literal code blocks for YAML examples

Without this, the straight double quotes (") are displayed as curved
quotes (“ and ”).

Port #10258 to v2

Fixes a brief spelling error

Fixes a simple spelling mistake that was bugging me when I read the online
docs. Trying to make the docs as great as possible.

Update add_host example in AWS Guide

The add_host module now uses "groups" instead of "groupname" to allow for specifying more than one group.

- fixed issue with previous commit with bad constants vs C ref on become
- added list-tags
- rearranged common options to utils/cli.py
- added generic validate for both vault and become conflicts
- removed dupes and conflicting options

added generic method to check supported become methods for the connection plugin

fixed command line PE options to be the same as in 1.9

Docsite returnval docs

Also fixing some other become-related things