update examples with expected after working

Author: CameronBrooks11

examples/arduino_multiplier/arduino_multiplier.ino

@@ -1,5 +1,14 @@
 #include <Wire.h>
 
+/*
+Expected output:
+```
+HH:MM:SS.mmm -> I2C Multiplier Slave at 0x40
+HH:MM:SS.mmm -> RX X=7  →  stored R=35
+HH:MM:SS.mmm -> TX R=35
+```
+*/
+
 static const uint8_t DEVICE_ADDRESS = 0x40;
 
 // Holds latest multiplied result (X * 5)

examples/master_multiplier/main.cpp

@@ -2,6 +2,15 @@
 #include <unistd.h> // for usleep
 #include "Wire.h"
 
+/*
+Expected output:
+```
+Pi → Nano Multiplier Test
+Sending X=7
+Received R=35 (expected 35)
+```
+*/
+
 static constexpr uint8_t DEVICE_ADDR = 0x40;
 
 int main()