src/sage/features/__init__.py: Fix docstring markup

Matthias Koeppe · Matthias Koeppe · commit d631a03a02ca · 2022-03-04T12:44:15.000-08:00
diff --git a/src/sage/features/__init__.py b/src/sage/features/__init__.py
@@ -387,7 +387,7 @@ def __repr__(self):
 
 def package_systems():
     """
-    Return a list of :class:~sage.features.pkg_systems.PackageSystem` objects
+    Return a list of :class:`~sage.features.pkg_systems.PackageSystem` objects
     representing the available package systems.
 
     The list is ordered by decreasing preference.
