Fix whitespace typo (#6231)

Author: dirk-schiller

docs/app/core-concepts/variables-and-aliases.mdx

@@ -21,7 +21,7 @@ sidebar_position: 40
 :::
 
 New users to Cypress may initially find it challenging to work with the
-asynchronous nature of our APIs.There are many ways to reference, compare and utilize the objects that Cypress
+asynchronous nature of our APIs. There are many ways to reference, compare and utilize the objects that Cypress
 commands yield you. Once you get the hang of async code you'll realize you can do everything you
 could do synchronously, without your code doing any backflips.