code: public void setInstructions(List<String> instructions) {
          synchronized (this.instructions) {
              this.instructions.clear();
              this.instructions.addAll(instructions);
          }
      }
docs: Sets the list of instructions that explain how to fill out the form and what the form is
  about. The dataform could include multiple instructions since each instruction could not
  contain newlines characters.
  
  @param instructions list of instructions that explain how to fill out the form.