updated docs (#853)

Co-authored-by: Andrey Ivanov <[email protected]>

Author: AndreyIvanov42

node/docs/minagent.md

@@ -26,6 +26,10 @@ Use the details below to determine when specific agent features were added:
 * `node` handler
   - Added in 1.95.1. Used node v5.10.1.
   - Updated in 2.117.0 to use node v6.10.3.
+* `node10` handler
+  - Added in 2.144.0. Used node v10.x
+* `node16` handler
+  - Added in 2.206.1. Used node v16.x
 * `powershell3` handler
   - Added in 1.95.1
   - Updated in 1.97 to propagate `Data` property for endpoints

node/docs/nodeEnvironment.md

@@ -12,6 +12,16 @@ To leverage this capability, simply add `Node10` as an execution target:
 },
 ```
 
+With agent version 2.206.1 Node 16 can be used.
+
+```
+"execution": {
+    "Node16": {
+        "target": "path/to/entry"
+    }
+},
+```
+
 Existing `Node` execution targets will still resolve to a Node 6 environment for now to maintain back-compat.
 
 ### Testing your task

node/docs/nodeVersioning.md

@@ -2,16 +2,16 @@
 
 ## Agent Node Handler
 
-The agent currently has 2 different node handlers that it can use to execute node tasks: Node 6 and Node 10.
+The agent currently has 3 different node handlers that it can use to execute node tasks: Node 6, Node 10, Node 16.
 The handler used depends on the `execution` property specified in the tasks `task.json`.
-If the `execution` property is specified to be `Node`, the task will run on the Node 6 handler, if it is specified to be `Node10` it will run on the Node 10 handler.
+If the `execution` property is specified to be `Node`, the task will run on the Node 6 handler, for `Node10` it will run on the Node 10 handler, for `Node16` it will run on the Node 16 handler.
 
 ## Mock-test Node Handler
 
 [Unit testing](https://docs.microsoft.com/en-us/azure/devops/extend/develop/add-build-task?view=azure-devops#step-2-unit-testing-your-task-scripts) of tasks can be done using the task-lib's built in mock-task functionality.
 To ensure tests are run in the same environment as the agent, this library looks for a `task.json` file in the same directory as the supplied task entry point.
 If no `task.json` is found it searches all ancestor directories as well.
-If the `task.json` is still not found, the library defaults to Node 10, otherwise it uses the appropriate handler based on the `execution` property.
+If the `task.json` is still not found, the library defaults to Node 16, otherwise it uses the appropriate handler based on the `execution` property.
 If this version of node is not found on the path, the library downloads the appropriate version.
 
 ### Behavior overrides