Correct MAX98357 part number in I2S library example

The "SimpleTone" example of the I2S bundled library uses a Maxim Integrated MAX98357 amplifier.

This part was incorrectly referred to as "MAX08357" in the comments, which is corrected here.

Reference:
https://www.maximintegrated.com/en/products/analog/audio/MAX98357A.html

Author: per1234

Diff for: libraries/I2S/examples/SimpleTone/SimpleTone.ino

@@ -1,11 +1,11 @@
 /*
  This example generates a square wave based tone at a specified frequency
  and sample rate. Then outputs the data using the I2S interface to a
- MAX08357 I2S Amp Breakout board.
+ MAX98357 I2S Amp Breakout board.
 
  Circuit:
  * Arduino/Genuino Zero, MKR family and Nano 33 IoT
- * MAX08357:
+ * MAX98357:
    * GND connected GND
    * VIN connected 5V
    * LRC connected to pin 0 (Zero) or 3 (MKR) or A2 (Nano)