Fix docstring of FullRepoManager (#750)

The render error originates from how we violate the syntax rules of the `field list` markup element of reStructuredText. The `specification of field list states](https://docutils.sourceforge.io/docs/ref/rst/restructuredtext.html#field-lists) that a multi-line `field body` must be indented relative to the `field marker`.

libcst/metadata/full_repo_manager.py

@@ -29,8 +29,8 @@ def __init__(
 
         :param paths: a collection of paths to access full repository data.
         :param providers: a collection of metadata provider classes require accessing full repository data, currently supports
-        :class:`~libcst.metadata.TypeInferenceProvider` and
-        :class:`~libcst.metadata.FullyQualifiedNameProvider`.
+            :class:`~libcst.metadata.TypeInferenceProvider` and
+            :class:`~libcst.metadata.FullyQualifiedNameProvider`.
         :param timeout: number of seconds. Raises `TimeoutExpired <https://docs.python.org/3/library/subprocess.html#subprocess.TimeoutExpired>`_
             when timeout.
         """