[PAN-2957] Add Java 11+ as a prerequisite for installing Pantheon using Homebrew. (#1755)

Signed-off-by: Adrian Sutton <adrian.sutton@consensys.net>

docs/Installation/Install-Binaries.md

@@ -8,6 +8,10 @@ description: Install Pantheon from binary distribution
 ### Prerequisites
 
 * [Homebrew](https://brew.sh/)
+* Java JDK
+
+!!!attention
+    Pantheon requires Java 11+ to compile; earlier versions are not supported. You can install Java using `brew cask install adoptopenjdk`. Alternatively, you can manually install the [Java JDK](http://www.oracle.com/technetwork/java/javase/downloads/index.html).
 
 ### Install Using Homebrew
 
@@ -15,7 +19,7 @@ description: Install Pantheon from binary distribution
 brew tap pegasyseng/pantheon
 brew install pantheon
 ```
-Display Pantheon command line help to confirm installation: 
+Display Pantheon command line help to confirm installation:
 
 ```bash
 pantheon --help
@@ -23,26 +27,26 @@ pantheon --help
 
 ## Linux / Unix / Windows
 
-### Prerequisites 
+### Prerequisites
 
 * [Java JDK](http://www.oracle.com/technetwork/java/javase/downloads/index.html)
 
 !!!attention
     Pantheon requires Java 11+ to compile; earlier versions are not supported.
-    Pantheon is currently supported only on 64-bit versions of Windows, and requires a 64-bit version of JDK/JRE. 
+    Pantheon is currently supported only on 64-bit versions of Windows, and requires a 64-bit version of JDK/JRE.
     We recommend that you also remove any 32-bit JDK/JRE installations.
-    
+
 !!! note "Linux Open File Limit"
-    If synchronizing to MainNet on Linux or other chains with large data requirements, increase the maximum 
-    number of open files allowed using `ulimit`. If the open files limit is not high enough, a `Too many open files` RocksDB exception occurs. 
+    If synchronizing to MainNet on Linux or other chains with large data requirements, increase the maximum
+    number of open files allowed using `ulimit`. If the open files limit is not high enough, a `Too many open files` RocksDB exception occurs.
 
 ### Install from Packaged Binaries
 
 Download the Pantheon [packaged binaries](https://bintray.com/consensys/pegasys-repo/pantheon/_latestVersion#files).
 
-Unpack the downloaded files and change into the `pantheon-<release>` directory. 
+Unpack the downloaded files and change into the `pantheon-<release>` directory.
 
-Display Pantheon command line help to confirm installation: 
+Display Pantheon command line help to confirm installation:
 
 ```bash tab="Linux/macOS"
 bin/pantheon --help
@@ -50,4 +54,4 @@ bin/pantheon --help
 
 ```bat tab="Windows"
 bin\pantheon --help
-```
+```