index: add example for rust

Signed-off-by: Sean Cross <sean@xobs.io>

index.html

@@ -387,6 +387,20 @@ dq.o.eq(
 
             <section>
                 <h2>SVD2Rust: Generating Safe Accessors</h2>
+                <pre><code class="rust">fn init(&mut self) {
+    self.registers
+        .ctrl
+        .write(|w| w.exe().bit(true).curren().bit(true).rgbleden().bit(true));
+    self.write(LEDDEN | FR250 | QUICK_STOP, LedRegister::LEDDCR0);
+
+    // Set clock register to 12 MHz / 64 kHz - 1
+    self.write(((12_000_000u32 / 64_000u32) - 1) as u8, LedRegister::LEDDBR);
+
+    self.write(
+        BREATHE_ENABLE | BREATHE_MODE_FIXED | breathe_rate_ms(128),
+        LedRegister::LEDDBCRR,
+    );
+}</code></pre>
                 <aside class="notes">
                     In addition to generating a reference manual for humans, we can generate an SVD
                     file that's usable in a wide variety of areas.  For example, we can turn an SVD