[DO NOT MERGE] feat(telemetry): feature docs (#6827)
# Description
### **NOTE:** This feature will not be enabled until 1.12
New telemetry feature reference
### Other PR's for this feature:
* [Feature Reference Docs](https://github.com/vercel/turbo/pull/6827)
(this PR)
* [CLI Reference Docs](https://github.com/vercel/turbo/pull/6826)
* [Feature implementation](https://github.com/vercel/turbo/pull/6743)
