Adopt OpenJDK11 (facebook#2800)

Author: svbutko

docs/_getting-started-macos-android.md

@@ -22,10 +22,10 @@ If you have already installed Node on your system, make sure it is Node 12 or ne
 We recommend installing JDK using [Homebrew](http://brew.sh/). Run the following commands in a Terminal after installing Homebrew:
 
 ```shell
-brew install --cask adoptopenjdk/openjdk/adoptopenjdk8
+brew install --cask adoptopenjdk/openjdk/adoptopenjdk11
 ```
 
-If you have already installed JDK on your system, make sure it is JDK 8 or newer.
+If you have already installed JDK on your system, make sure it is JDK 11 or newer.
 
 <h3>Android development environment</h3>
 

docs/_getting-started-windows-android.md

@@ -10,15 +10,15 @@ We recommend installing Node via [Chocolatey](https://chocolatey.org), a popular
 
 It is recommended to use an LTS version of Node. If you want to be able to switch between different versions, you might want to install Node via [nvm-windows](https://github.com/coreybutler/nvm-windows), a Node version manager for Windows.
 
-React Native also requires [Java SE Development Kit (JDK)](https://openjdk.java.net/projects/jdk8/), which can be installed using Chocolatey as well.
+React Native also requires [Java SE Development Kit (JDK)](https://openjdk.java.net/projects/jdk/11/), which can be installed using Chocolatey as well.
 
 Open an Administrator Command Prompt (right click Command Prompt and select "Run as Administrator"), then run the following command:
 
 ```powershell
-choco install -y nodejs-lts openjdk8
+choco install -y nodejs-lts openjdk11
 ```
 
-If you have already installed Node on your system, make sure it is Node LTS 12 or newer. If you already have a JDK on your system, make sure it is version 8 or newer.
+If you have already installed Node on your system, make sure it is Node 12 or newer. If you already have a JDK on your system, make sure it is version 11 or newer.
 
 > You can find additional installation options on [Node's Downloads page](https://nodejs.org/en/download/).