Added latestFeature example

Author: IEvangelist

docs/core/tools/global-json.md

@@ -1,7 +1,7 @@
 ---
 title: global.json overview
 description: Learn how to use the global.json file to set the .NET Core SDK version when running .NET Core CLI commands.
-ms.date: 01/14/2020
+ms.date: 04/21/2020
 ms.custom: "updateeachrelease"
 ---
 # global.json overview
@@ -113,6 +113,17 @@ The following example shows how to use the exact specified version:
 }
 ```
 
+The following example shows how to use the latest feature band and patch version installed of a specific major and minor version (in the form, 3.1.xxx):
+
+```json
+{
+  "sdk": {
+    "version": "3.1.000",
+    "rollForward": "latestFeature"
+  }
+}
+```
+
 The following example shows how to use the highest patch version installed of a specific version (in the form, 3.1.1xx):
 
 ```json