chore: fix typos (#633)

Author: xiaolou86

src/method.rs

@@ -463,7 +463,7 @@ mod test {
     }
 
     #[test]
-    fn test_extention_method() {
+    fn test_extension_method() {
         assert_eq!(Method::from_str("WOW").unwrap(), "WOW");
         assert_eq!(Method::from_str("wOw!!").unwrap(), "wOw!!");
 

src/uri/mod.rs

@@ -956,7 +956,7 @@ impl PartialEq<str> for Uri {
 
         if other.len() < path.len() || path.as_bytes() != &other[..path.len()] {
             if absolute && path == "/" {
-                // PathAndQuery can be ommitted, fall through
+                // PathAndQuery can be omitted, fall through
             } else {
                 return false;
             }