Removed trailing whitespace

src/liballoc/str.rs

@@ -1783,7 +1783,7 @@ pub fn parse<F: FromStr>(&self) -> Result<F, F::Err> {
     }
 
     /// Converts a `Box<str>` into a `Box<[u8]>` without copying or allocating.
-    /// 
+    ///
     /// # Examples
     ///
     /// Basic usage: