doc: Fix errors more prettily

src/adc.rs

@@ -20,7 +20,7 @@ impl ADCLine {
 
     /// Initialize an ADC line identified by the line number it is assigned on the board
     ///
-    /// Safety: See [Self::init()]
+    /// Safety: See [.init()][Self::init()]
     pub unsafe fn from_number(line: u32) -> Result<Self, i32> {
         let line = riot_sys::macro_ADC_LINE(line);
         Self::init(line)

src/async_helpers.rs

@@ -14,7 +14,7 @@ use core::future::Future;
 /// While this can legally be implemented without unsafe, practical use will require unsafe, and
 /// that requires sticking to the rules:
 ///
-/// * Whenever [Self::poll()] is called, do whatever the future needs to do after having been awoken. If
+/// * Whenever [.poll()][Self::poll()] is called, do whatever the future needs to do after having been awoken. If
 ///   this returns [core::task::Poll::Pending] (and the future wants to be polled ever again), it
 ///   must then pass on the `arg` to some RIOT callback setter together with a static function of a
 ///   suitable signature. Conventionally, that function is called `Self::callback()`.

src/gpio/mod.rs

@@ -96,7 +96,7 @@ impl GPIO {
     /// # }
     /// ```
     ///
-    /// See [Self::from_c()] for safety constraints.
+    /// See [.from_c()][Self::from_c()] for safety constraints.
     pub fn from_port_and_pin(port: u32, pin: u32) -> Option<Self> {
         Self::from_c(unsafe { riot_sys::macro_GPIO_PIN(port, pin) })
     }