doc/source/how-to/releasing.rst: fix powershell nested variable

Author: anscfrisson

doc/source/how-to/releasing.rst

@@ -474,7 +474,7 @@ You can download artifacts from the Ansys private PyPI, public PyPI, and GitHub.
 
                     .. code-block:: powershell
     
-                        $env:INDEX_URL="https://$PYANSYS_PYPI_PRIVATE_READ_PAT@pkgs.dev.azure.com/pyansys/_packaging/pyansys/pypi/simple/"
+                        $env:INDEX_URL="https://$env:PYANSYS_PYPI_PRIVATE_READ_PAT@pkgs.dev.azure.com/pyansys/_packaging/pyansys/pypi/simple/"
                         python -m pip install ansys-<product/tool>-<library> --index-url $env:INDEX_URL --no-dependencies
     
         .. tab-item:: macOS