Update global-json.md - add example for dotnet new globalJson with ro… (#42203)

Author: jbrekle

docs/core/tools/dotnet-new-sdk-templates.md

@@ -833,6 +833,11 @@ API Controller with or without read/write actions.
 - **`--sdk-version <VERSION_NUMBER>`**
 
   Specifies the version of the .NET SDK to use in the *global.json* file.
+  
+- **`--roll-forward <ROLL_FORWARD_POLICY>`**
+
+  The roll-forward policy to use when selecting an SDK version, either as a fallback when a specific SDK version is missing or as a directive to use a later version.
+  For more information, see [global-json](global-json.md#rollforward).
 
 ## `editorconfig`
 

docs/core/tools/dotnet-new.md

@@ -148,7 +148,7 @@ Each template may have additional options defined. For more information, see [.N
 - Create a *global.json* in the current directory setting the SDK version to 8.0.101:
 
   ```dotnetcli
-  dotnet new globaljson --sdk-version 8.0.101
+  dotnet new globaljson --sdk-version 8.0.101 --roll-forward latestFeature
   ```
 
 - Show help for the C# console application template:

docs/core/tools/global-json.md

@@ -172,7 +172,7 @@ To install additional .NET SDK versions on your machine, visit the [Download .NE
 You can create a new *global.json* file in the current directory by executing the [dotnet new](dotnet-new.md) command, similar to the following example:
 
 ```dotnetcli
-dotnet new globaljson --sdk-version 8.0.302
+dotnet new globaljson --sdk-version 8.0.302 --roll-forward latestFeature
 ```
 
 ## Matching rules