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                        ch13-03: Use correct variable name
Hey Rust folks 👋 ,
First of, thanks for this amazing book! Now onto this tiny fix.
The code where this paragraph references to uses file_path instead of filename as the variable name:
https://github.com/rust-lang/book/blob/a60f4316ec923a5ac2ed6a2eba6960edb832d855/listings/ch13-functional-features/listing-13-20/src/lib.rs#L23-L25
This fix should use the matching variable name according to the Rust code.