chore(portal-demo): fixed typo in example (#2202)

* Fixed typo in portal-demo.html

* Fixed typo in portal-demo.html

Author: LOZORD

src/demo-app/portal/portal-demo.html

@@ -27,5 +27,5 @@ <h2> The portal host is here: </h2>
 
 <div *portal>
  <p> - Did you hear about this year's Fibonacci Conference? </p>
- <p> - It's going to be as the last two put together. </p>
+ <p> - It's going to be as big as the last two put together. </p>
 </div>