fix: doc/source/how-to/releasing.rst: fix variables

[anscfrisson]

• f0a6e25 doc/source/how-to/releasing.rst: use double quotes for variable expansion (otherwise INDEX_URL literally equals https://$PYANSYS_PYPI_PRIVATE_READ_PAT@pkgs.dev.azure.com/pyansys/_packaging/pyansys/pypi/simple/)
• f002664 doc/source/how-to/releasing.rst: fix powershell nested variable

[RobPasMue]

LGTM!

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[anscfrisson]

@RobPasMue Thanks for having approved this PR!

I have added another commit after you approved: f002664 doc/source/how-to/releasing.rst: fix powershell nested variable and reframed the scope of this PR in the title: fix variables.

The pre-commit.ci job over the first 2 commits initially failed with:

timeout waiting for merge ref

I tested my changes locally with pre-commit run --files doc/source/how-to/releasing.rst which did not change the file.

Since I could not re-run the precommit.ci job, I tried to bypass the pre-commit.ci checks by pushing a commit: git commit --allow-empty -m"[skip pre-commit.ci]", but the pre-commit.ci passed anyway.

What are the usual ways to solve pre-commit.ci jobs failing with timeout waiting for merge ref?

[RobPasMue]

First time I see those fails... pretty weird! Seems like something transient anyway. Thanks for the PR. Merging now!