Argument fmt in inspect() is undocumented

[etiennebacher]

Description

Maybe something like this?

String to format the print output. Use "{}" where you want to print the value of the expression.

Link

https://docs.pola.rs/api/python/dev/reference/expressions/api/polars.Expr.inspect.html

[cmdlineluser]

It could probably also be renamed to format (or f_string like in pl.format?)

I think all usages of fmt= in the API were previously updated.