Remove outdated "single sourcing package version" advice.

Now that Python 3.7 is EOL and importlib.metadata is available in all non-EOL Python versions, it is no longer advisable to keep a __version__ attribute in the source code. Use importlib.metadata.version() to retrieve a version string from package metadata if necessary.
pypa · Jul 23, 2024 · 6cad57c · 6cad57c
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diff --git a/source/guides/section-build-and-publish.rst b/source/guides/section-build-and-publish.rst
@@ -7,7 +7,6 @@ Building and Publishing
 
    writing-pyproject-toml
    distributing-packages-using-setuptools
-   single-sourcing-package-version
    dropping-older-python-versions
    packaging-binary-extensions
    packaging-namespace-packages

diff --git a/source/guides/single-sourcing-package-version.rst b/source/guides/single-sourcing-package-version.rst
diff --git a/source/guides/writing-pyproject-toml.rst b/source/guides/writing-pyproject-toml.rst
@@ -163,8 +163,7 @@ This field is required, although it is often marked as dynamic using
    dynamic = ["version"]
 
 This allows use cases such as filling the version from a ``__version__``
-attribute or a Git tag. Consult :ref:`Single sourcing the version` for more
-details.
+attribute or a Git tag.
 
 
 Dependencies and requirements