message: Fix typo in TrebleBoost_wApp
diff: * TrebleBoost_wApp
  *
  * Created: Chip Audette, OpenAudio, August 2021
  -* Purpose: Process audio by applying a high-pass filter followed by gain. Include App interaction.
  +* Purpose: Process audio by applying a high-pass filter followed by gain. Includes App interaction.
  *
  * TympanRemote App: https://play.google.com/store/apps/details?id=com.creare.tympanRemote
  *
  -* As a tutorial on how to interact with the mobile phone App, you should first explote the previous
  +* As a tutorial on how to interact with the mobile phone App, you should first explore the previous
  * example, which was "BasicGain_wApp".
  *
  * Here in "TrebleBoost_wApp", we started with the example sketch "01-Basic\TrebleBoost" and added
  