Fixed plantuml

Author: Chuxel

containers/plantuml/.devcontainer/Dockerfile

@@ -3,7 +3,7 @@
 # Licensed under the MIT License. See LICENSE in the project root for license information.
 #-----------------------------------------------------------------------------------------
 
-FROM java:11
+FROM openjdk:8
 
 # Install git, process tools
 RUN apt-get update && apt-get -y install git procps

containers/plantuml/README.md

@@ -2,7 +2,7 @@
 
 ## Summary
 
-*Use PlantUML without installing all the dependencies locally. Includes Java, GraphViz, and the PlantUML extension.*
+*Demonstrates using PlantUML local rendering without installing dependencies. Includes Java, GraphViz, and the PlantUML extension.*
 
 | Metadata | Value |  
 |----------|-------|
@@ -12,27 +12,13 @@
 
 ## Usage
 
-First, install the **[Visual Studio Code Remote Development](https://aka.ms/vscode-remote/download/extension)** extension pack if you have not already.
+[See here for information on using this and other definitions in your project](../../README.md#using-a-definition). There are no addtional steps required.
 
-To use the definition with your own project:
+### Try it
 
-1. Copy the `.devcontainer` folder into your project root.
-2. Reopen the folder in the container (e.g. using the **Remote-Container: Reopen Folder in Container** command in VS Code) to use it unmodified.
-
-If you prefer, you can look through the contents of the `.devcontainer` folder to understand how to make changes to your own project.
-
-If you want to try out the test project instead, run **Remote-Container: Open Folder in Container...** in VS Code and select a cloned copy of the entire folder. 
-
-Check out the samples folder or just do a markdown preview on this file once you've opened this folder in the container!
-
-```plantuml
-@startuml
-Brain -> Brain: Wait, VS Code can do that?
-Brain -> Mouth: Say "Cool!"
-Mouth -> Ear: Cool!
-Ear -> Brain: Heard myself say Cool!
-@enduml
-````
+1. Run **Remote-Container: Open Folder in Container...** in VS Code and select a cloned copy of this entire folder.
+2. The container will build and VS Code will connect.
+3. Open `sample.plantuml` in the `test-project` folder and hit Alt-D.
 
 ## License