Fix typo - hyphenate Single-File Component (#1824)

See #1788 for an explanation

Author: peterhauke

src/tutorial/src/step-2/description.md

@@ -2,7 +2,7 @@
 
 <div class="sfc">
 
-What you see in the editor is a Vue Single File Component (SFC). An SFC is a reusable self-contained block of code that encapsulates HTML, CSS and JavaScript that belong together, written inside a `.vue` file.
+What you see in the editor is a Vue Single-File Component (SFC). An SFC is a reusable self-contained block of code that encapsulates HTML, CSS and JavaScript that belong together, written inside a `.vue` file.
 
 </div>