Add LinkOption import in npm sample code

Author: spinn

examples/support-page/Example.vue

@@ -54,7 +54,7 @@
   import QuestionModel, { QuestionType, ChoiceOption, LinkOption } from '../../src/models/QuestionModel'
   import LanguageModel from '../../src/models/LanguageModel'
   // If using the npm package, use the following line instead of the ones above.
-  // import FlowForm, { QuestionModel, QuestionType, ChoiceOption, LanguageModel } from '@ditdot-dev/vue-flow-form'
+  // import FlowForm, { QuestionModel, QuestionType, ChoiceOption, LinkOption, LanguageModel } from '@ditdot-dev/vue-flow-form'
 
   export default {
     name: 'example',