query_as_with not properly documented and no examples

[liciana24]

Bug Description

the query_as_with function is not properly documented and has no examples. does not seem to work similar to query_as() with fetch_one(). clarification needed.

Minimal Reproduction

https://docs.rs/sqlx/latest/sqlx/fn.query_as_with.html

Info

• SQLx version: [REQUIRED]
• SQLx features enabled: [REQUIRED]
• Database server and version: [REQUIRED] (MySQL / Postgres / SQLite <x.y.z>)
• Operating system: [REQUIRED]
• rustc --version: [REQUIRED]