Adds required prop to the post merge pipeline

Two different MRs updating the same code were merged
and this was not caught prior to merge.
This MR adds the missing prop to the post merge pipeline

app/assets/javascripts/vue_merge_request_widget/mr_widget_options.vue

@@ -356,6 +356,7 @@ export default {
         :has-ci="mr.hasCI"
         :source-branch="mr.targetBranch"
         :source-branch-link="mr.targetBranch"
+        :troubleshooting-docs-path="mr.troubleshootingDocsPath"
       />
       <deployment
         v-for="postMergeDeployment in mr.postMergeDeployments"