Update wrapping message (#23104)

Updating the --wrap-column help message to reflect reality.

packages/flutter_tools/lib/src/runner/flutter_command_runner.dart

@@ -69,8 +69,9 @@ class FlutterCommandRunner extends CommandRunner<void> {
         defaultsTo: true);
     argParser.addOption('wrap-column',
         hide: !verboseHelp,
-        help: 'Sets the output wrap column. If not set, uses the width of the terminal, or 100 if '
-            'the output is not a terminal. Use --no-wrap to turn off wrapping entirely.',
+        help: 'Sets the output wrap column. If not set, uses the width of the terminal. No '
+            'wrapping occurs if not writing to a terminal. Use --no-wrap to turn off wrapping '
+            'when connected to a terminal.',
         defaultsTo: null);
     argParser.addOption('device-id',
         abbr: 'd',