Revert "Wrong directory for installation??"

README.md

@@ -30,15 +30,19 @@ Boards manager link: `http://arduino.esp8266.com/stable/package_esp8266com_index
 
 Documentation: [https://arduino-esp8266.readthedocs.io/en/2.4.2/](https://arduino-esp8266.readthedocs.io/en/2.4.2/)
 
-### Using git version
+### Using git version (basic instructions)
 [![Linux build status](https://travis-ci.org/esp8266/Arduino.svg)](https://travis-ci.org/esp8266/Arduino)
 
 - Install the current upstream Arduino IDE at the 1.8 level or later. The current version is at the [Arduino website](http://www.arduino.cc/en/main/software).
-- Go to Arduino application directory
+- Go to Arduino directory
   - For Mac OS X, it is `Arduino.app` showing as the Arduino icon.  
     This location may be your `~/Downloads`, `~/Desktop` or even `/Applications`.
     ```bash
-    cd <application-directory>/Arduino.app/Contents/
+    cd <application-directory>/Arduino.app/Contents/Java
+    ```
+  - For Linux, it is ~/arduino by default.
+    ```bash
+    cd ~arduino
     ```
 - Clone this repository into hardware/esp8266com/esp8266 directory (or clone it elsewhere and create a symlink)
 ```bash