fix style and format

src/async_impl/client.rs

@@ -954,7 +954,10 @@ impl ClientBuilder {
     ///
     /// Pass `None` to disable HTTP2 keep-alive.
     /// Default is currently disabled.
-    pub fn http2_keep_alive_interval(mut self, interval: impl Into<Option<Duration>>) -> ClientBuilder {
+    pub fn http2_keep_alive_interval(
+        mut self,
+        interval: impl Into<Option<Duration>>,
+    ) -> ClientBuilder {
         self.config.http2_keep_alive_interval = interval.into();
         self
     }