Update ANDROID_HOME to ANDROID_SDK_ROOT

docs/_getting-started-linux-android.md

@@ -47,23 +47,23 @@ Next, select the "SDK Tools" tab and check the box next to "Show Package Details
 
 Finally, click "Apply" to download and install the Android SDK and related build tools.
 
-<h4>3. Configure the ANDROID_HOME environment variable</h4>
+<h4>3. Configure the ANDROID_SDK_ROOT environment variable</h4>
 
 The React Native tools require some environment variables to be set up in order to build apps with native code.
 
 Add the following lines to your `$HOME/.bash_profile` or `$HOME/.bashrc` (if you are using `zsh` then `~/.zprofile` or `~/.zshrc`) config file:
 
 ```shell
-export ANDROID_HOME=$HOME/Android/Sdk
-export PATH=$PATH:$ANDROID_HOME/emulator
-export PATH=$PATH:$ANDROID_HOME/tools
-export PATH=$PATH:$ANDROID_HOME/tools/bin
-export PATH=$PATH:$ANDROID_HOME/platform-tools
+export ANDROID_SDK_ROOT=$HOME/Android/Sdk
+export PATH=$PATH:$ANDROID_SDK_ROOT/emulator
+export PATH=$PATH:$ANDROID_SDK_ROOT/tools
+export PATH=$PATH:$ANDROID_SDK_ROOT/tools/bin
+export PATH=$PATH:$ANDROID_SDK_ROOT/platform-tools
 ```
 
 > `.bash_profile` is specific to `bash`. If you're using another shell, you will need to edit the appropriate shell-specific config file.
 
-Type `source $HOME/.bash_profile` for `bash` or `source $HOME/.zprofile` to load the config into your current shell. Verify that ANDROID_HOME has been set by running `echo $ANDROID_HOME` and the appropriate directories have been added to your path by running `echo $PATH`.
+Type `source $HOME/.bash_profile` for `bash` or `source $HOME/.zprofile` to load the config into your current shell. Verify that ANDROID_SDK_ROOT has been set by running `echo $ANDROID_SDK_ROOT` and the appropriate directories have been added to your path by running `echo $PATH`.
 
 > Please make sure you use the correct Android SDK path. You can find the actual location of the SDK in the Android Studio "Preferences" dialog, under **Appearance & Behavior** → **System Settings** → **Android SDK**.
 

docs/_getting-started-macos-android.md

@@ -64,23 +64,23 @@ Next, select the "SDK Tools" tab and check the box next to "Show Package Details
 
 Finally, click "Apply" to download and install the Android SDK and related build tools.
 
-<h4>3. Configure the ANDROID_HOME environment variable</h4>
+<h4>3. Configure the ANDROID_SDK_ROOT environment variable</h4>
 
 The React Native tools require some environment variables to be set up in order to build apps with native code.
 
 Add the following lines to your `$HOME/.bash_profile` or `$HOME/.bashrc` (if you are using `zsh` then `~/.zprofile` or `~/.zshrc`) config file:
 
 ```shell
-export ANDROID_HOME=$HOME/Library/Android/sdk
-export PATH=$PATH:$ANDROID_HOME/emulator
-export PATH=$PATH:$ANDROID_HOME/tools
-export PATH=$PATH:$ANDROID_HOME/tools/bin
-export PATH=$PATH:$ANDROID_HOME/platform-tools
+export ANDROID_SDK_ROOT=$HOME/Library/Android/sdk
+export PATH=$PATH:$ANDROID_SDK_ROOT/emulator
+export PATH=$PATH:$ANDROID_SDK_ROOT/tools
+export PATH=$PATH:$ANDROID_SDK_ROOT/tools/bin
+export PATH=$PATH:$ANDROID_SDK_ROOT/platform-tools
 ```
 
 > `.bash_profile` is specific to `bash`. If you're using another shell, you will need to edit the appropriate shell-specific config file.
 
-Type `source $HOME/.bash_profile` for `bash` or `source $HOME/.zprofile` to load the config into your current shell. Verify that ANDROID_HOME has been set by running `echo $ANDROID_HOME` and the appropriate directories have been added to your path by running `echo $PATH`.
+Type `source $HOME/.bash_profile` for `bash` or `source $HOME/.zprofile` to load the config into your current shell. Verify that ANDROID_SDK_ROOT has been set by running `echo $ANDROID_SDK_ROOT` and the appropriate directories have been added to your path by running `echo $PATH`.
 
 > Please make sure you use the correct Android SDK path. You can find the actual location of the SDK in the Android Studio "Preferences" dialog, under **Appearance & Behavior** → **System Settings** → **Android SDK**.
 

docs/_getting-started-windows-android.md

@@ -62,16 +62,16 @@ Next, select the "SDK Tools" tab and check the box next to "Show Package Details
 
 Finally, click "Apply" to download and install the Android SDK and related build tools.
 
-<h4>3. Configure the ANDROID_HOME environment variable</h4>
+<h4>3. Configure the ANDROID_SDK_ROOT environment variable</h4>
 
 The React Native tools require some environment variables to be set up in order to build apps with native code.
 
 1. Open the **Windows Control Panel.**
 2. Click on **User Accounts,** then click **User Accounts** again
 3. Click on **Change my environment variables**
-4. Click on **New...** to create a new `ANDROID_HOME` user variable that points to the path to your Android SDK:
+4. Click on **New...** to create a new `ANDROID_SDK_ROOT` user variable that points to the path to your Android SDK:
 
-![ANDROID_HOME Environment Variable](/docs/assets/GettingStartedAndroidEnvironmentVariableANDROID_HOME.png)
+![ANDROID_SDK_ROOT Environment Variable](/docs/assets/GettingStartedAndroidEnvironmentVariableANDROID_SDK_ROOT.png)
 
 The SDK is installed, by default, at the following location:
 
@@ -85,7 +85,7 @@ Open a new Command Prompt window to ensure the new environment variable is loade
 
 1. Open powershell
 2. Copy and paste **Get-ChildItem -Path Env:\\** into powershell
-3. Verify `ANDROID_HOME` has been added
+3. Verify `ANDROID_SDK_ROOT` has been added
 
 <h4>4. Add platform-tools to Path</h4>