Refine script/bench-rust-gif crates.io URL
// This program exercises the Rust GIF decoder at
// https://github.com/image-rs/image-gif
-// which is the top result for https://crates.io/search?q=gif
+// which is the top result for https://crates.io/search?q=gif&sort=downloads
//
// Wuffs' C code doesn't depend on Rust per se, but this program gives some
// performance data for specific Rust GIF implementations. The equivalent Wuffs
