Update Arduino/hardware path (espressif#1727)

Author: tnoborio

docs/arduino-ide/debian_ubuntu.md

@@ -22,10 +22,10 @@ Installation instructions for Debian / Ubuntu OS
 
 
 
-- If you have Arduino.app installed to /Applications/, modify the installation as follows, beginning at `mkdir -p ~/Arduino...`:
+- If you have Arduino installed to ~/, modify the installation as follows, beginning at `mkdir -p ~/Arduino/hardware`:
 
 ```bash
-  cd /Applications/Arduino_*/Contents/java/hardware/
+  cd ~/Arduino/hardware
   mkdir -p espressif && \
   cd espressif && \
   git clone https://github.com/espressif/arduino-esp32.git esp32 && \