Update document

Author: luojia65

src/watchdog.rs

@@ -1,7 +1,7 @@
 //! Traits for interactions with a processors watchdog timer.
 
 /// Feeds an existing watchdog to ensure the processor isn't reset. Sometimes
-/// the "feeding" operation is commonly referred to as "refreshing".
+/// the "feeding" operation is also referred to as "refreshing".
 pub trait Watchdog {
     /// An enumeration of `Watchdog` errors.
     ///