Update example code

src/bin/bitfield.rs

@@ -7,7 +7,7 @@ use {{crate_name}} as _; // global logger + panicking-behavior + memory layout
 fn main() -> ! {
     // value of the FREQUENCY register (nRF52840 device; RADIO peripheral)
     let frequency: u32 = 276;
-    defmt::debug!("FREQUENCY: {0:0..7}, MAP: {0:8..9}", frequency);
+    defmt::debug!("FREQUENCY: {0=0..7}, MAP: {0=8..9}", frequency);
 
     {{crate_name}}::exit()
 }

src/bin/format.rs

@@ -20,7 +20,7 @@ fn main() -> ! {
     let s = S1 { x: 42, y: S2 { z: 43 } };
     defmt::info!("s={:?}", s);
     let x = 42;
-    defmt::info!("x={:u8}", x);
+    defmt::info!("x={=u8}", x);
 
     {{crate_name}}::exit()
 }

src/bin/overflow.rs

@@ -10,7 +10,7 @@ fn main() -> ! {
 }
 
 fn ack(m: u32, n: u32) -> u32 {
-    defmt::info!("ack(m={:u32}, n={:u32})", m, n);
+    defmt::info!("ack(m={=u32}, n={=u32})", m, n);
     let mut big = [2; 512];
     if m == 0 {
         n + 1