chore : doc readOnly code

Author: Tayebsed93

ouds_core/lib/components/checkbox/ouds_checkbox.dart

@@ -62,6 +62,7 @@ enum ToggleableState { off, indeterminate, on }
 ///       });
 ///     },
 ///   isError: false,
+///   readOnly: false,
 /// );
 /// ```
 ///

ouds_core/lib/components/radio_button/ouds_radio_button.dart

@@ -63,6 +63,7 @@ import 'package:ouds_theme_contract/ouds_theme.dart';
 ///        // Handle radio button change state.
 ///    }
 ///    isError: false,
+///    readOnly: false,
 /// );
 /// ```
 ///

ouds_core/lib/components/switch/ouds_switch.dart

@@ -48,6 +48,7 @@ import 'package:ouds_theme_contract/theme/tokens/components/ouds_switch_tokens.d
 ///     onChanged: (newValue) {
 ///           // Handle switch change state.
 ///       }
+///     readOnly: false,
 ///   );
 /// ```
 ///