Refer to PyPI API tokens as such in GitHub secret names, spell in uppercase

GitHub seems to default to uppercase nowadays, and in PyPI terms
this is about API tokens instead of passwords as such.

Refs pypa/gh-action-pypi-publish#52 (review)

Author: scop

source/guides/github-actions-ci-cd-sample/publish-to-test-pypi.yml

@@ -31,10 +31,10 @@ jobs:
     - name: Publish distribution 📦 to Test PyPI
       uses: pypa/gh-action-pypi-publish@master
       with:
-        password: ${{ secrets.test_pypi_password }}
+        password: ${{ secrets.TEST_PYPI_API_TOKEN }}
         repository_url: https://test.pypi.org/legacy/
     - name: Publish distribution 📦 to PyPI
       if: startsWith(github.ref, 'refs/tags')
       uses: pypa/gh-action-pypi-publish@master
       with:
-        password: ${{ secrets.pypi_password }}
+        password: ${{ secrets.PYPI_API_TOKEN }}

source/guides/publishing-package-distribution-releases-using-github-actions-ci-cd-workflows.rst

@@ -37,11 +37,11 @@ Let's begin! 🚀
 2. In a separate browser tab or window, go to the ``Settings``
    tab of your target repository and then click on `Secrets`_
    in the left sidebar.
-3. Create a new secret called ``pypi_password`` and copy-paste
+3. Create a new secret called ``PYPI_API_TOKEN`` and copy-paste
    the token from the fist step.
 4. Now, go to https://test.pypi.org/manage/account/#api-tokens
    and repeat the steps. Save that TestPyPI token on GitHub
-   as ``test_pypi_password``.
+   as ``TEST_PYPI_API_TOKEN``.
 
    .. attention::