docs: fix nested modals example

Part-of: <!93>

docs/components/modal/index.md

@@ -88,17 +88,13 @@ const open5 = ref(false)
 
 ```vue-html
 <fw-modal v-model="open" title="My modal">
-  Modal content
+  <fw-modal v-model="openNested" title="My modal">
+    Nested modal content
+  </fw-modal>
 
-  <template #actions>
-    <fw-button @click="open = false" color="secondary">
-      Cancel
-    </fw-button>
-
-    <fw-button @click="open = false">
-      Ok
-    </fw-button>
-  </template>
+  <fw-button @click="openNested = true">
+    Open nested modal
+  </fw-button>
 </fw-modal>
 
 <fw-button @click="open = true">
@@ -107,9 +103,9 @@ const open5 = ref(false)
 ```
 
 <fw-modal v-model="open4" title="My modal">
-<fw-modal v-model="open5" title="My modal">
-  Nested modal content
-</fw-modal>
+  <fw-modal v-model="open5" title="My modal">
+    Nested modal content
+  </fw-modal>
   <fw-button @click="open5 = true">
     Open nested modal
   </fw-button>