remove space in html-questions

Author: maxrchung

src/questions/html-questions.md

@@ -16,4 +16,4 @@ permalink: /questions/html-questions/index.html
 * Why you would use a `srcset` attribute in an image tag? Explain the process the browser uses when evaluating the content of this attribute.
 * Have you used different HTML templating languages before?
 * What is the difference between `canvas` and `svg`?
-* What are empty elements in HTML ?
+* What are empty elements in HTML?