Simplify LLM docs generation

[Anton-4]

Experience has shown you only need names and types, e.g.:

Bool.false : Bool
Bool.true : Bool
Decode.fromBytesPartial : List U8, fmt -> DecodeResult val where val implements Decoding, fmt implements DecoderFormatting
Dict.empty : {} -> Dict * *
Dict.fromList : List (k, v) -> Dict k v
Dict.get : Dict k v, k -> Result v [KeyNotFound]
Dict.insert : Dict k v, k, v -> Dict k v
Dict.insertAll : Dict k v, Dict k v -> Dict k v
Dict.joinMap : Dict a b, (a, b -> Dict x y) -> Dict x y

This old PR should show you where to apply the changes: https://github.com/roc-lang/roc/pull/7190/files

Recommended experience; basic Rust