docs(guide): fix typo in node-extent vue-flow property

Author: srborines

docs/src/guide/vue-flow/config.md

@@ -571,7 +571,7 @@ const elements = ref([
 </template>
 ```
 
-### nodes-extent (optional)
+### node-extent (optional)
 
 - Type: [`CoordinateExtent`](/typedocs/types/CoordinateExtent)