Ensure trailing " is not including in PATH var

Author: pjcollins

build-tools/automation/azure-pipelines.yaml

@@ -305,7 +305,8 @@ stages:
 
     - template: environment/win/vs-msbuild.v1.yml@yaml   # Display (in log) VS installation(s) including installation status with associated MSBuild location(s)
 
-    - script: echo "##vso[task.setvariable variable=PATH]$(Build.SourcesDirectory)\.dotnet;%PATH%"
+    - script: |
+        echo ##vso[task.setvariable variable=PATH]$(Build.SourcesDirectory)\.dotnet;%PATH%
       displayName: add local dotnet installation to PATH
 
     - task: MSBuild@1