docgen: Run cargo fmt

Format the source according to the default rules. This provides a
baseline for future changes to require well-formatted source.

Signed-off-by: David Brown <[email protected]>

Author: d3zd3z

docgen/src/lib.rs

@@ -11,6 +11,5 @@ extern crate zephyr;
 
 #[no_mangle]
 extern "C" fn rust_main() {
-    printkln!("Hello world from Rust on {}",
-              zephyr::kconfig::CONFIG_BOARD);
+    printkln!("Hello world from Rust on {}", zephyr::kconfig::CONFIG_BOARD);
 }