Edit to fix a linting error

I got errors when I tried to pull my changes,
The edit to fix included:
 - Adding a blank space bellow a new created heading
 - Capitalize a proper name: html > HTML

After inspecting I found that there were 2 errors related to already existed *proper-names*, but I didn't touch them, which mean even after this change, linting error will not solved completely.

foundations/html_css/html-foundations/lists.md

@@ -46,7 +46,8 @@ Ordered lists are created using the `<ol>` element. Each individual item in them
 <script async src="https://cpwebassets.codepen.io/assets/embed/ei.js"></script>
 
 ### Quick Tip
-Imagine if you have multiple lists to type; you might find yourself typing `<li></li>` repeatedly, or you might type it once and *copy/paste* it until you're done. However, there is a more efficient way using **Emmet Abbreviation**, something you might have already experienced with the `!` character to quickly generate the full html boilerplate.
+
+Imagine if you have multiple lists to type; you might find yourself typing `<li></li>` repeatedly, or you might type it once and *copy/paste* it until you're done. However, there is a more efficient way using **Emmet Abbreviation**, something you might have already experienced with the `!` character to quickly generate the full HTML boilerplate.
 
 Now, we will show you how to use Emmet to create lists more efficiently. Imagine you need to write an unordered list with 11 items. To do this using Emmet, simply type `ul>li*11` and hit `Enter` or `Tab`.