Merge pull request #729 from stm32-rs/doc

document sdio

Cargo.toml

@@ -23,7 +23,7 @@ repository = "https://github.com/stm32-rs/stm32f4xx-hal"
 version = "0.20.0"
 
 [package.metadata.docs.rs]
-features = ["stm32f429", "usb_fs", "can", "i2s", "fsmc_lcd", "rtic1", "defmt"]
+features = ["stm32f429", "usb_fs", "can", "i2s", "fsmc_lcd", "rtic1", "defmt", "sdio-host"]
 targets = ["thumbv7em-none-eabihf"]
 
 [dependencies]

src/fsmc_lcd/pins.rs

@@ -174,6 +174,7 @@ pub struct DataPins16 {
 impl DataPins for DataPins16 {}
 
 impl DataPins16 {
+    #[allow(clippy::too_many_arguments)]
     #[inline(always)]
     pub fn new(
         d0: impl Into<alt::D0>,

src/rng.rs

@@ -137,7 +137,7 @@ impl Rng {
         }
     }
 
-    /// Releases ownership of the [RNG](crate::pac::RNG) peripheral object
+    /// Releases ownership of the [`RNG`] peripheral object
     /// (after which `self` can't be used anymore).
     pub fn release(self) -> RNG {
         self.rb