In expr.str.slice() indicate whether an index of 0 or 1 means "start at the start of the string"

[DeflateAwning]

Description

I always have trouble figuring out how to use slice as I mentally switch between Rust, Python, Ruby, C, and others, each with their own indexing systems.

Perhaps adding a column example which slices .str.slice(1, 3) to the example with "payaya" would be helpful.

Idea: name the columns literally ".str.slice(1, 3)", ".str.slice(4, 3)" for clarity.

Link

https://docs.pola.rs/py-polars/html/reference/expressions/api/polars.Expr.str.slice.html#polars.Expr.str.slice