fix a typo in 04-upgrading.md (mmistakes#1487)

docs/_docs/04-upgrading.md

@@ -8,7 +8,7 @@ toc: true
 
 If you're using the [Ruby Gem]({{ "/docs/quick-start-guide/#ruby-gem-method" | absolute_url }}) or [remote theme]({{ "/docs/quick-start-guide/#github-pages-method" | absolute_url }}) versions of Minimal Mistakes, upgrading is fairly painless.
 
-To check which version you are currently using, view the source of your built site and you should something similar to:
+To check which version you are currently using, view the source of your built site and you should see something similar to:
 
 ```
 <!--
@@ -86,4 +86,4 @@ Here's a quick checklist of the important folders/files you'll want to be mindfu
 ---
 
 **Note:** If you're not seeing the latest version, be sure to flush browser and CDN caches. Depending on your hosting environment older versions of `/assets/css/main.css`, `/assets/js/main.min.js`, or `*.html` may be cached.
-{: .notice--info}
+{: .notice--info}