refactor(getting-started): path to sdk binaries (#2991)

Author: henryhobhouse

docs/_getting-started-linux-android.md

@@ -47,23 +47,21 @@ 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/Library/Android/sdk
+export PATH=$PATH:$ANDROID_SDK_ROOT/emulator
+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

@@ -61,34 +61,25 @@ Select the "SDK Platforms" tab from within the SDK Manager, then check the box n
 - `Android SDK Platform 30`
 - `Intel x86 Atom_64 System Image` or `Google APIs Intel x86 Atom System Image`
 
-Next, select the "SDK Tools" tab and check the box next to "Show Package Details" here as well. Look for and expand the "Android SDK Build-Tools" entry, then make sure that `30.0.2` is selected and check the "Android SDK Command-line Tools (latest)".
+Next, select the "SDK Tools" tab and check the box next to "Show Package Details" here as well. Look for and expand the "Android SDK Build-Tools" entry, then make sure that `30.0.2` is selected.
 
 Finally, click "Apply" to download and install the Android SDK and related build tools.
 
-You can also run the following command after setting ANDROID_HOME.
-
-```shell
-sdkmanager "platforms;android-30" "system-images;android-30;default;x86_64" "system-images;android-30;google_apis;x86"
-sdkmanager "cmdline-tools;latest" "build-tools;30.0.2"
-```
-
-<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/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**.