Fix path for packing (#83017)

* Fix path for packing

* Apply PR feedback

* Update docs/workflow/building/libraries/README.md
Co-authored-by: NAdeel Mujahid <3840695+am11@users.noreply.github.com>

* Update docs/workflow/building/libraries/README.md
Co-authored-by: NAdeel Mujahid <3840695+am11@users.noreply.github.com>

---------
Co-authored-by: NViktor Hofer <viktor.hofer@microsoft.com>
Co-authored-by: NAdeel Mujahid <3840695+am11@users.noreply.github.com>

docs/workflow/building/libraries/README.md

@@ -238,11 +238,11 @@ To build a library's package, simply invoke `dotnet pack` on the src project aft
 
 ```cmd
 build libs
-dotnet pack src\libraries\System.Text.Json\src\
+dotnet.cmd pack src\libraries\System.Text.Json\src\
 ```
 
 Same as for `dotnet build` or `dotnet publish`, you can specify the desired configuration via the `-c` flag:
 
 ```cmd
-dotnet pack src\libraries\System.Text.Json\src\ -c Release
+dotnet.cmd pack src\libraries\System.Text.Json\src\ -c Release
 ```