Remove instructions for openjdk-8 (#486)

`openjdk-8` is deprecated.

docs/user/software/development/android.md

@@ -17,13 +17,7 @@ Before we can start we need to setup our build environment ready for building An
 
 ### Installing Build Dependencies
 
-Android 7 (Nougat) and Android 8 (Oreo) require OpenJDK 8. Android 5 (Lollipop) and Android 6 (Marshmallow) require OpenJDK 7 which is not currently in the repository.
-
-To install OpenJDK 8 run:
-
-```bash
-sudo eopkg it openjdk-8-devel
-```
+Android 7 (Nougat) and Android 8 (Oreo) require OpenJDK 8. Android 5 (Lollipop) and Android 6 (Marshmallow) require OpenJDK 7. Both OpenJDK 7 and OpenJDK 8 are not currently in the repository.
 
 Next we need to install packages from the `system.devel` component, these provide common build tools for general software development.
 

docs/user/software/development/java.md

@@ -19,7 +19,6 @@ The following table lists the versions of Java available in the Solus repositori
 
 | Version | Package name | Installation directory  | Included components | Notes                 |
 | ------- | ------------ | ----------------------- | ------------------- | --------------------- |
-| Java 8  | `openjdk-8`  | `/usr/lib64/openjdk-8`  | JRE, JDK            | See _openjdk-8_ below |
 | Java 11 | `openjdk-11` | `/usr/lib64/openjdk-11` | JRE, JDK, OpenJFX   |                       |
 | Java 17 | `openjdk-17` | `/usr/lib64/openjdk-17` | JRE, JDK            |                       |
 
@@ -37,11 +36,3 @@ There are multiple ways to execute Java applications in Solus:
 - Create a script that sets `JAVA_HOME` before running the application.
 - Symlink the java executable from `/path/to/jdk/bin` to `/usr/bin`.
 - Add `/path/to/jdk/bin` to your PATH environment variable.
-
-## openjdk-8
-
-:::danger Important
-
-openjdk-8 is scheduled for removal in the near future. It is not recommended that you use it today.
-
-:::