chore(Upgrade guide): removed verbiage on button aria-disabled

Author: Eric Olkowski

packages/documentation-site/patternfly-docs/content/get-started/upgrade.md

@@ -199,4 +199,4 @@ Reach out to us on Slack
 Ask a question in GitHub Discussions
 </Button>
 
-**Note:** If you use a custom solution to replicate PatternFly styling (without using PatternFly components), then your product will need to be re-skinned. This may be a large undertaking, so we encourage you to get help from the PatternFly team.
+**Note:** If you use a custom solution to replicate PatternFly styling (without using PatternFly components), then your product will need to be re-skinned. This may be a large undertaking, so we encourage you to get help from the PatternFly team.