[ci skip] docs: Update documentation for Java 17

COMPILING.adoc

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+= Compiling
+
+You can compile FastAsyncWorldEdit as long as you have some version of Java greater than or equal to 17 installed. Gradle will download JDK 17 specifically if needed,
+but it needs some version of Java to bootstrap from.
+
+Note that if you have JRE 8 installed, Gradle will currently attempt to use that to compile, which will not work. It is easiest to uninstall JRE 8 and replace it with JDK 17.
+
+You can get the JDK 17 link:https://adoptium.net/[here] from Adoptium.
+
+The build process uses Gradle, which you do *not* need to download. FastAsyncWorldEdit is a multi-module project with three active modules:
+
+* `worldedit-core` contains the FastAsyncWorldEdit API
+* `worldedit-bukkit` is the Bukkit plugin
+* `worldedit-cli` is the command line interface
+
+== To compile...
+
+=== On Windows
+
+1. Shift + right-click the folder with FastAsyncWorldEdit's files and click "Open command prompt".
+2. `gradlew clean build`
+
+=== On Linux, BSD, or Mac OS X
+
+1. In your terminal, navigate to the folder with FastAsyncWorldEdit's files (`cd /folder/of/fawe/files`)
+2. `./gradlew clean build`
+
+== Then you will find...
+
+You will find:
+
+* The core FastAsyncWorldEdit API in **worldedit-core/build/libs**
+* FastAsyncWorldEdit for Bukkit in **worldedit-bukkit/build/libs**
+* the CLI version in **worldedit-cli/build/libs**
+
+If you want to use FastAsyncWorldEdit, use the `FastAsyncWorldEdit-<identifier>` version obtained in **worldedit-bukkit/build/libs**.
+
+(The `-#` version includes FastAsyncWorldEdit + necessary libraries.)
+
+== Other commands
+
+* `gradlew idea` will generate an link:https://www.jetbrains.com/idea/[IntelliJ IDEA] module for each folder.
+
+_Possibly broken_:
+* `gradlew eclipse` will generate an link:https://www.eclipse.org/downloads/[Eclipse] project for each folder.
+