update doc

lib/terminal/terminal.dart

@@ -199,10 +199,7 @@ class Terminal with Observable {
     refresh();
   }
 
-  /// Writes data to the terminal. Special characters are interpreted. To write
-  /// terminal sequences, [Terminal.write] should be used instead. Writing a
-  /// terminal sequence by calling [Terminal.writeChar] multiple times is not
-  /// supported.
+  /// Writes data to the terminal. Special characters are interpreted.
   ///
   /// See also: [Buffer.writeChar]
   void writeChar(int codePoint) {