Razor documentation improvements

This makes several changes for PE 3.3's Razor documentation, primarily centered
around consistency (factual and formatting):

- How to query help documentation for each command
- `create-task` has no `description` or `os_version` arguments
- Including `task` argument in `create-repo`
- Using just the name, rather than a hash, in object references (preferred)
- `create-policy` cannot create tags
- `create-policy`'s max_count should be an integer
- Adding the real command name after the summary/title (included in 3.2 too)
- Typos/grammar fixes (included in 3.2 too)
- Separating `add-policy-tag` and `remove-policy-tag` (included in 3.2 too)