Typo "Github Actions"→"GitHub Actions" (#18160)

https://docs.microsoft.com/en-us/powershell/module/az.websites/update-azstaticwebapp?view=azps-7.5.0
https://github.com/Azure/azure-powershell/blob/main/src/Websites/Websites/help/Update-AzStaticWebApp.md
#PingMSFTDocs

Author: hyoshioka0128

src/Websites/Websites/help/Update-AzStaticWebApp.md

@@ -328,7 +328,7 @@ Accept wildcard characters: False
 
 ### -RepositoryToken
 A user's github repository token.
-This is used to setup the Github Actions workflow file and API secrets.
+This is used to setup the GitHub Actions workflow file and API secrets.
 
 ```yaml
 Type: System.String