Add supported language for actions anchors, closes #1659

docs/actions.md

@@ -2,11 +2,17 @@
 # Creating and invoking OpenWhisk actions
 
 
-Actions are stateless code snippets that run on the OpenWhisk platform. An action can be a JavaScript function, a Swift function, or a custom executable program packaged in a Docker container. For example, an action can be used to detect the faces in an image, aggregate a set of API calls, or post a Tweet.
+Actions are stateless code snippets that run on the OpenWhisk platform. An action can be written as a JavaScript, Swift, or Python function, a Java method, or a custom executable program packaged in a Docker container. For example, an action can be used to detect the faces in an image, respond to a database change, aggregate a set of API calls, or post a Tweet.
 
-Actions can be explicitly invoked, or run in response to an event. In either case, a run of an action results in an activation record that is identified by a unique activation ID. The input to an action and the result of an action are a dictionary of key-value pairs, where the key is a string and the value a valid JSON value.
+Actions can be explicitly invoked, or run in response to an event. In either case, each run of an action results in an activation record that is identified by a unique activation ID. The input to an action and the result of an action are a dictionary of key-value pairs, where the key is a string and the value a valid JSON value. Actions can also be composed of calls to other actions or a defined sequence of actions.
+
+Learn how to create, invoke, and debug actions in your preferred development environment:
+* [JavaScript](#creating-and-invoking-javascript-actions)
+* [Swift](#creating-swift-actions)
+* [Python](#creating-python-actions)
+* [Java](#creating-java-actions)
+* [Docker](#creating-docker-actions)
 
-Actions can be composed of calls to other actions or a defined sequence of actions.
 
 ## Creating and invoking JavaScript actions
 
@@ -765,7 +771,7 @@ You can clean up by deleting actions that you do not want to use.
   ```
   actions
   ```
-  
+
 ## Accessing action metadata within the action body
 
 The action environment contains several properties that are specific to the running action.