Fix docstring-to-rustdoc usage

ctru-sys/bindgen.sh

@@ -29,6 +29,6 @@ bindgen "$DEVKITPRO/libctru/include/3ds.h" \
     -D__3DS__ \
 > src/bindings.rs
 
-cargo docstring-to-rustdoc src/bindings.rs
+cargo run --package docstring-to-rustdoc -- src/bindings.rs
 
 cargo fmt --all

ctru-sys/docstring-to-rustdoc/src/main.rs

@@ -2,8 +2,8 @@
 //!
 //! # Usage
 //!
-//! `cargo docstring-to-rustdoc [location of the bindings.rs]`
-//! Example: `cargo docstring-to-rustdoc src/bindings.rs`
+//! `cargo run --package docstring-to-rustdoc -- [location of the bindings.rs]`
+//! Example: `cargo run --package docstring-to-rustdoc -- src/bindings.rs`
 //!
 //! # Transformations
 //!