Clarify --appId help text for the CI single-app auto-select case

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 00c29930-8fdc-4c0c-80cc-d45ed0a5d077

Author: azchohfi

MSStore.CLI/Commands/InitCommand.cs

@@ -81,7 +81,7 @@ bool IsUri()
 
             AppIdOption = new Option<string>("--appId", "-id")
             {
-                Description = "Specifies the Application Id to configure the project with. If not provided, the application will be selected interactively, which is not possible on CI/CD environments."
+                Description = "Specifies the Application Id to configure the project with. If not provided, the application is selected interactively, which is not possible on CI/CD environments, unless the account has a single application."
             };
 
             PackageOption = new Option<bool>("--package")