fix(#997): optimize editor tips

ui/src/i18n/locales/en.json

@@ -1,7 +1,7 @@
 {
   "how_to_format": {
     "title": "How to Format",
-    "description": "<ul><li><p>to make links</p><pre><code>&lt;https: //url.com&gt;<br/><br/>[Title](https: //url.com)</code></pre></li><li><p>put returns between paragraphs</p></li><li><p><em>italic</em> or **<strong>bold</strong>**</p></li><li><p>indent code by 4 spaces</p></li><li><p>quote by placing &gt; at start of line</p></li><li><p>backtick escapes <code>`like _so_`</code></p></li><li><p>create code fences with backticks `</p><pre><code>``` <br/>code here<br/>```</code></pre></li></ul>"
+    "description": "<ul><li><p>to make links</p><pre><code>&lt;https://url.com&gt;<br/><br/>[Title](https://url.com)</code></pre></li><li><p>put returns between paragraphs</p></li><li><p><em>_italic_</em> or **<strong>bold</strong>**</p></li><li><p>indent code by 4 spaces</p></li><li><p>quote by placing &gt; at start of line</p></li><li><p>backtick escapes <code>`like _so_`</code></p></li><li><p>create code fences with backticks `</p><pre><code>``` <br/>code here<br/>```</code></pre></li></ul>"
   },
   "pagination": {
     "prev": "Prev",

ui/src/pages/Questions/Ask/index.tsx

@@ -414,7 +414,7 @@ const Ask = () => {
                 {t('title', { keyPrefix: 'how_to_format' })}
               </Card.Header>
               <Card.Body
-                className="fmt"
+                className="fmt small"
                 dangerouslySetInnerHTML={{
                   __html: t('description', { keyPrefix: 'how_to_format' }),
                 }}