fix typo in migration guide

Author: chrisvfritz

src/guide/migration.md

@@ -1052,7 +1052,7 @@ You may notice that:
 {% raw %}
 <div class="upgrade-path">
   <h4>Upgrade Path</h4>
-  <p>Run the <a href="https://github.com/vuejs/vue-migration-helper">migration helper</a> on your codebase to find examples of filters used in directives like `v-model`. If you miss any, you should also see <strong>console errors</strong>.</p>
+  <p>Run the <a href="https://github.com/vuejs/vue-migration-helper">migration helper</a> on your codebase to find examples of filters used in directives like <code>v-model</code>. If you miss any, you should also see <strong>console errors</strong>.</p>
 </div>
 {% endraw %}