docs(wokwi-hc-sr04.md): add multiple-sensor array-of-structs example (#219)

Add https://wokwi.com/projects/412101524873288705 with an extensible five sensor array-of-struct.

Author: drf5n

docs/parts/wokwi-hc-sr04.md

@@ -76,3 +76,4 @@ Try [this example on Wokwi](https://wokwi.com/projects/304444938977804866)
 - [Seven segment distance display](https://wokwi.com/projects/295030553275532810)
 - [Franzininho ultrasonic sensor](https://wokwi.com/projects/302020345098928648)
 - [Parking sensor](https://wokwi.com/projects/290964046833779209)
+- [Multiple Sensor Array](https://wokwi.com/projects/412101524873288705)