Touch up documentation strings for DigitalOcean.
Update playbooks_variables.rst

incorrect/confusing wording in Jinja2 note?
Merge pull request #6347 from dwheaton/patch-1

Update playbooks_variables.rst
Merge pull request #6344 from alimony/patch-1

Touch up documentation strings for DigitalOcean.
Check for skipped tags in passed role variables before adding to them

Fixes #6330