User Story 37654: Create Extensions base package

- Fixed variable name typo.

Author: paulmedynski

eng/pipelines/stages/ci-build-extensions-package-stage.yml

@@ -69,7 +69,7 @@ stages:
       variables:
         # The directory where dotnet artifacts will be staged.  Not to be
         # confused with pipeline artifacts.
-        - name: dotnatArtifactsDir
+        - name: dotnetArtifactsDir
           value: $(Build.StagingDirectory)/dotnetArtifacts
 
         # The directory where the NuGet packages will be staged before being