Fix incorrect indentation in importlib.metadata.rst (GH-126189)

Author: rffontenelle

Doc/library/importlib.metadata.rst

@@ -229,10 +229,10 @@ Distribution metadata
 .. class:: PackageMetadata
 
    A concrete implementation of the
-    `PackageMetadata protocol <https://importlib-metadata.readthedocs.io/en/latest/api.html#importlib_metadata.PackageMetadata>`_.
+   `PackageMetadata protocol <https://importlib-metadata.readthedocs.io/en/latest/api.html#importlib_metadata.PackageMetadata>`_.
 
-    In addition to providing the defined protocol methods and attributes, subscripting
-    the instance is equivalent to calling the :meth:`!get` method.
+   In addition to providing the defined protocol methods and attributes, subscripting
+   the instance is equivalent to calling the :meth:`!get` method.
 
 Every `Distribution Package <https://packaging.python.org/en/latest/glossary/#term-Distribution-Package>`_
 includes some metadata, which you can extract using the :func:`!metadata` function::