docs: switch to fenced codeblocks (#31806)

site/content/docs/5.0/helpers/position.md

@@ -10,33 +10,33 @@ toc: true
 
 Position an element at the top of the viewport, from edge to edge. Be sure you understand the ramifications of fixed position in your project; you may need to add additional CSS.
 
-{{< highlight html >}}
+```html
 <div class="fixed-top">...</div>
-{{< /highlight >}}
+```
 
 ## Fixed bottom
 
 Position an element at the bottom of the viewport, from edge to edge. Be sure you understand the ramifications of fixed position in your project; you may need to add additional CSS.
 
-{{< highlight html >}}
+```html
 <div class="fixed-bottom">...</div>
-{{< /highlight >}}
+```
 
 ## Sticky top
 
 Position an element at the top of the viewport, from edge to edge, but only after you scroll past it. The `.sticky-top` utility uses CSS's `position: sticky`, which isn't fully supported in all browsers.
 
-{{< highlight html >}}
+```html
 <div class="sticky-top">...</div>
-{{< /highlight >}}
+```
 
 ## Responsive sticky top
 
 Responsive variations also exist for `.sticky-top` utility.
 
-{{< highlight html >}}
+```html
 <div class="sticky-sm-top">Stick to the top on viewports sized SM (small) or wider</div>
 <div class="sticky-md-top">Stick to the top on viewports sized MD (medium) or wider</div>
 <div class="sticky-lg-top">Stick to the top on viewports sized LG (large) or wider</div>
 <div class="sticky-xl-top">Stick to the top on viewports sized XL (extra-large) or wider</div>
-{{< /highlight >}}
+```