docs: fix grammar errors (#7594)

src/picker/PickerColumn.js

@@ -166,7 +166,7 @@ export default createComponent({
       this.setIndex(index, true);
 
       // compatible with desktop scenario
-      // use setTimeout to skip the click event triggered after touchstart
+      // use setTimeout to skip the click event Emitted after touchstart
       setTimeout(() => {
         this.moving = false;
       }, 0);