Apply suggestions from code review

Author: cmaureir

src/content/pages/guidelines.mdx

@@ -35,7 +35,7 @@ are:
   have in a talk, as long as the slides naturally flow with your spoken narrative and don’t overwhelm
   your audience with information.
 * The resolution of the projectors is 1920x1080px, so be mindful in case your
-  computer has a different one, or a 4k screen, so you can test that before.
+  computer has a different one, like a 4k screen, so you can test that before.
 
 This [wonderful blog
 post](https://distinct-browser-08c.notion.site/purplecon-tips-for-writing-a-good-conference-talk-cab51d9bfd474e26ae4b021a7a12f38b)