Merge pull request #9196 from samtsai15/patch-1

Update guide.pug

Author: vkarpov15

docs/guide.pug

@@ -364,7 +364,7 @@ block content
     Only non-virtual properties work as part of queries and for field selection.
     Since virtuals are not stored in MongoDB, you can't query with them.
 
-    <h5 id="aliases"><a href="#aliases">Aliases</a></h5>
+    <h3 id="aliases"><a href="#aliases">Aliases</a></h3>
 
     Aliases are a particular type of virtual where the getter and setter
     seamlessly get and set another property. This is handy for saving network