pytest_plugin(fix): Wrap long docstring line to satisfy ruff E501

why: Line exceeded 88 character limit (was 89 chars)
what:
- Split docstring first line for async_svn_repo fixture

Author: tony

src/libvcs/pytest_plugin.py

@@ -889,7 +889,9 @@ async def async_svn_repo(
         projects_path: pathlib.Path,
         svn_remote_repo: pathlib.Path,
     ) -> t.AsyncGenerator[AsyncSvnSync, None]:
-        """Pre-made async svn checkout of remote repo checked out to user's projects dir.
+        """Pre-made async svn checkout of remote repo.
+
+        Checked out to user's projects dir.
 
         Async equivalent of :func:`svn_repo` fixture.