docs: fix some typos (#1531)

Signed-off-by: cuishuang <imcusg@gmail.com>

CHANGELOG.md

@@ -579,7 +579,7 @@
 ### Breaking Changes
 
 - hyper has been upgraded to 0.11, so `header`, `StatusCode`, and `Method` have breaking changes.
-- `mime` has been ugpraded to 0.3, with a very different API.
+- `mime` has been upgraded to 0.3, with a very different API.
 - All configuration methods have been removed from the `Client`, and moved to the `ClientBuilder`.
 - The `HttpVersion` type was completely removed.
 - `Error::cause()` now returns `Error::get_ref().cause()`.

src/error.rs

@@ -60,7 +60,7 @@ impl Error {
         self.inner.url.as_ref()
     }
 
-    /// Returns a mutable referene to the URL related to this error
+    /// Returns a mutable reference to the URL related to this error
     ///
     /// This is useful if you need to remove sensitive information from the URL
     /// (e.g. an API key in the query), but do not want to remove the URL