Correct typos

Found via codespell.

README.md

@@ -119,7 +119,7 @@ S3Proxy emulates the following operations:
 * copy multi-part objects, see [#76](https://github.com/gaul/s3proxy/issues/76)
 
 The wiki collects
-[compatability notes](https://github.com/gaul/s3proxy/wiki/Storage-backend-compatibility)
+[compatibility notes](https://github.com/gaul/s3proxy/wiki/Storage-backend-compatibility)
 for specific storage backends.
 
 Support

src/main/java/org/gaul/s3proxy/AwsSignature.java

@@ -118,9 +118,9 @@ final class AwsSignature {
                 .append('\n');
         String expires = request.getParameter("Expires");
         if (queryAuth) {
-            // If expires is  not nil, then it is query string sign
-            // If expires is nil,maybe alse query string sign
-            // So should check other accessid para ,presign to judge.
+            // If expires is not nil, then it is query string sign
+            // If expires is nil, maybe also query string sign
+            // So should check other accessid param, presign to judge.
             // not the expires
             builder.append(Strings.nullToEmpty(expires));
         }  else {