pretty_printer.rs: Don't use a URL as an example Input title

Otherwise Rust 1.53.0 gets confused during `cargo doc` because it thinks
we want an actual URL:

    warning: this URL is not a hyperlink
    --> src/pretty_printer.rs:331:40
        |
    331 |     /// The title for the input (e.g. "http://example.com/example.txt")
        |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use an automatic link instead: `<http://example.com/example.txt>`
        |
        = note: `#[warn(rustdoc::bare_urls)]` on by default
        = note: bare URLs are not automatically turned into clickable links

It was perhaps also a bit confusing to give an URL as an example in the
first place, because according to our own API example
`examples/inputs.rs` it is meant to be more a free-text thing.

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