Add enum values to CLI reference doc

[jbogarthyde]

🚀 Feature request

Enumerated values for CLI command arguments and options need to be documented.

Command (mark with an x)

ng analytics
(see #15039)
There might be more - have to do a search.

- [ ] new
- [ ] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Description

The doc generated for CLI command args don't specify type (since they are all strings), but this means that they don't capture enumerated type values, which do need to be documented.

Describe the solution you'd like

To be consistent with other reference doc, the values should captured automatically and descriptions should be part of the arg or option description. Currently, I don't think there is room for them in the straight-text description of the arg itself -- should be markdown to accommodate a bullet list.

Describe alternatives you've considered

We can list and describe them in the command's long description (as in PR 15039)

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