fix: MASH to SMASH THAT START BUTTON

I natively speak portuguese but also fluent in English, I saw "MASH THAT START BUTTON" and became like what is now? is some word I haven't learned yet...

Search a little bit and became like naaah it was a mistake, it must be "SMASH".

Author: Uanela

docs/app/get-started/open-the-app.mdx

@@ -124,7 +124,7 @@ just scroll down and hit "Continue".
 Lastly, you're presented with the list of compatible browsers Cypress found on
 your system. To understand more about your options here, see
 [our guide on launching browsers](/app/references/launching-browsers). Again,
-don't sweat it, you can switch browsers whenever you want. Now **MASH THAT
+don't sweat it, you can switch browsers whenever you want. Now **SMASH THAT
 START BUTTON!**
 
 ## Next Steps