Update events.md - Diff between Options API and Composition API text (#2550)

* Update events.md - Diff between Options API and Composition API text

The emits support for object sintax for Options API text was displayed for both, Options and Composition API.

* Update events.md - in span instead of repeat code in different divs

* Update events.md - fix options-api class

* Update src/guide/components/events.md

Co-authored-by: Natalia Tepluhina <[email protected]>

---------

Co-authored-by: Natalia Tepluhina <[email protected]>

Author: leoelz

src/guide/components/events.md

@@ -176,7 +176,7 @@ export default {
 
 </div>
 
-The `emits` option also supports an object syntax, which allows us to perform runtime validation of the payload of the emitted events:
+The `emits` option and `defineEmits()` macro also support an object syntax, which allows us to perform runtime validation of the payload of the emitted events:
 
 <div class="composition-api">