Merge pull request #814 from Lotterleben/rtic2-blinky-mono-doc

rtic2-tick: clarify SysTick mono instructions

examples/rtic2-tick.rs

@@ -2,6 +2,11 @@
 #![no_std]
 #![feature(type_alias_impl_trait)]
 
+//Add this to Cargo.toml if you want to use SysTick as monotonic timer
+//[dependencies.rtic-monotonics]
+//version = "2.0"
+//features = ["cortex-m-systick"]
+
 use defmt_rtt as _;
 use panic_probe as _;
 use rtic_time::Monotonic;
@@ -12,7 +17,8 @@ use stm32f4xx_hal::{
 };
 type Mono = stm32f4xx_hal::timer::MonoTimerUs<pac::TIM3>;
 
-// Uncomment if use SysTick as monotonic timer
+// To use SysTick as monotonic timer, uncomment the lines below
+// *and* remove the Mono type alias above
 //use rtic_monotonics::systick::prelude::*;
 //systick_monotonic!(Mono, 1000);
 
@@ -59,8 +65,3 @@ mod app {
  }
  }
 }
-
-//Add this to Cargo.toml if use SysTick as monotonic timer
-//[dependencies.rtic-monotonics]
-//version = "2.0"
-//features = ["cortex-m-systick"]