Change flag to switch

Co-authored-by: Oscar Hinton <[email protected]>

docs/getting-started/server/guide.md

@@ -363,7 +363,7 @@ repository.
     pwsh setup_secrets.ps1
     ```
 
-The helper script also supports an optional `-clear` flag which removes all existing settings before
+The helper script also supports an optional `-clear` switch which removes all existing settings before
 re-applying them:
 
 ```bash