Link the specification for the returned data makes it clearer what this is
and what the format of the version string can be.
.. function:: version(distribution_name)
- Return the installed distribution package version for the named
- distribution package.
+ Return the installed distribution package
+ `version <https://packaging.python.org/en/latest/specifications/core-metadata/#version>`__
+ for the named distribution package.
Raises :exc:`PackageNotFoundError` if the named distribution
package is not installed in the current Python environment.