Fix typo

src/response.rs

@@ -273,7 +273,7 @@ where
     ///
     /// This is not valid for chunked responses as it requires that the body bytes over-read
     /// while parsing the http response header would be available for the body reader.
-    /// For this case, of if the original buffer is not large enough, use
+    /// For this case, or if the original buffer is not large enough, use
     /// [`BodyReader::read_to_end()`] instead from the reader returned by [`ResponseBody::reader()`].
     pub async fn read_to_end(self) -> Result<&'buf mut [u8], Error> {
         // We can only read responses with Content-Length header to end using the body_buf buffer,