chat tools picker: mention that changes will be applied to mode file (microsoft#253073)

Author: aeschli

src/vs/workbench/contrib/chat/browser/actions/chatToolActions.ts

@@ -121,10 +121,10 @@ class ConfigureToolsAction extends Action2 {
 				break;
 			case ToolsScope.Mode:
 				placeholder = localize('chat.tools.placeholder.mode', "Select tools for this chat mode");
-				description = localize('chat.tools.description.mode', "The selected tools are configured by the '{0}' chat mode.", widget.input.currentModeObs.get().name);
+				description = localize('chat.tools.description.mode', "The selected tools are configured by the '{0}' chat mode. Changes to the tools will be applied to the mode file as well.", widget.input.currentModeObs.get().name);
 				break;
 			case ToolsScope.Global:
-				placeholder = localize('chat.tools.placeholder.global', "Select tools that are available to chat");
+				placeholder = localize('chat.tools.placeholder.global', "Select tools that are available to chat.");
 				description = undefined;
 				break;
 		}