`rev` inconsistent with astral-sh/ruff-pre-commit

## Description
In `astral-sh/uv-pre-commit` examples, `rev` is listed as `X.X.X`.
In `astral-sh/ruff-pre-commit` examples, `rev` is listed as `vX.X.X`.

I am not sure if this is a documentation bug or an implementation bug, but it would be good to have them match.

Start by comparing the uv-pre-commit and ruff-pre-commit example configurations and determine whether their revision formats should match. Done means the examples use a consistent format, or the implementation behavior is clarified if the difference is intentional.

Written by the indexing model from the issue text.