Change GPIO inherent methods back to `&self`.

With the embedded-hal rc3 update I changed them to require `&mut self`, but
in retrospect I think `&self` is better, for extra flexibility.

This PR reverts the changes from the rc3 update to inherent methods.

1 files changed, 1 insertions, 1 deletions

diff --git a/docs/modules/ROOT/examples/layer-by-layer/blinky-hal/src/main.rs b/docs/modules/ROOT/examples/layer-by-layer/blinky-hal/src/main.rs
index 54b87662e..d0c9f4907 100644
--- a/docs/modules/ROOT/examples/layer-by-layer/blinky-hal/src/main.rs
+++ b/docs/modules/ROOT/examples/layer-by-layer/blinky-hal/src/main.rs
@@ -9,7 +9,7 @@ use {defmt_rtt as _, panic_probe as _};
 fn main() -> ! {
     let p = embassy_stm32::init(Default::default());
     let mut led = Output::new(p.PB14, Level::High, Speed::VeryHigh);
-    let mut button = Input::new(p.PC13, Pull::Up);
+    let button = Input::new(p.PC13, Pull::Up);
 
     loop {
         if button.is_low() {