Fix typos

Author: hannobraun

src/dma.rs

@@ -144,7 +144,7 @@ impl<T, C, B> Transfer<T, C, B, Ready>
     /// Start the DMA transfer
     ///
     /// Consumes this instance of `Transfer` and returns a new one, with its
-    /// state changes to indicate that the transfer has been started.
+    /// state changed to indicate that the transfer has been started.
     pub fn start(self) -> Transfer<T, C, B, Started> {
         compiler_fence(Ordering::SeqCst);
 

src/i2c.rs

@@ -138,7 +138,7 @@ where
         // Push out a byte of data
         self.i2c.txdr.write(|w| w.txdata().bits(byte));
 
-        // While until byte is transferred
+        // Wait until byte is transferred
         loop {
             let isr = self.i2c.isr.read();
             if isr.berr().bit_is_set() {