- Fix minor grammatical issues
- Include the `strict_two_level` model in the enforcement model
section
- Improve readability
- Add enforcement examples in the form of diagrams
Change-Id: I483bf172dfe01f1db5a9673192eac988267996da
Some of the admin guide pages were prefixed with "identity-" because
they came from the centralized install guide or operators guide or
security guide or somewhere else. We don't need the prefix, everything
in keystone is identity. Remove the prefix from the affected pages so
that everything is consistent.
Change-Id: Icd172a39fe720472f1fb15395178f90282696ac9