docs: fix typos and grammar in events documentation (tauri-apps#3564)

Author: vsumavane

src/content/docs/develop/_sections/frontend-listen.mdx

@@ -64,8 +64,8 @@ appWebview.once('ready', () => {});
 ```
 
 :::note
-Events emitted in the frontend also triggers listeners registed by these APIs.
-For more information see the [Calling Rust from the Frontend] documentation.
+Events emitted in the frontend also trigger listeners registered by these APIs.
+For more information, see the [Calling Rust from the Frontend] documentation.
 :::
 
 #### Listening to Events on Rust