chore(meta/watch): refine var names

Author: drmingdrmer

Diff for: src/meta/service/src/api/grpc/grpc_service.rs

@@ -245,8 +245,8 @@ impl MetaService for MetaServiceImpl {
         let add_res = mn.add_watcher(request.into_inner(), tx).await;
 
         match add_res {
-            Ok(watcher_info) => {
-                let stream = WatchStream::new(rx, watcher_info, mn.dispatcher_handle.clone());
+            Ok(watcher) => {
+                let stream = WatchStream::new(rx, watcher, mn.dispatcher_handle.clone());
                 Ok(Response::new(Box::pin(stream) as Self::WatchStream))
             }
             Err(e) => {

Diff for: src/meta/service/src/watcher/watcher_stream.rs

@@ -92,10 +92,10 @@ impl<T> Drop for WatchStream<T> {
 
 impl<T> WatchStream<T> {
     /// Create a new `WatcherStream`.
-    pub fn new(rx: Receiver<T>, watcher_info: Watcher, dispatcher: EventDispatcherHandle) -> Self {
+    pub fn new(rx: Receiver<T>, watcher: Watcher, dispatcher: EventDispatcherHandle) -> Self {
         Self {
             inner: rx,
-            watcher: watcher_info,
+            watcher,
             dispatcher,
         }
     }