10668: improved description of the HomsetsOf class

Author: nthiery

src/sage/categories/homsets.py

@@ -134,13 +134,11 @@ class HomsetsOf(HomsetsCategory):
     """
     Default class for homsets of a category.
 
-    This is used for structure categories that do not define a homsets
-    category of their own.
-
-    This is needed because, unlike for covariant functorial
-    constructions, we cannot represent the homset category of such a
-    category by just the join of the homset categories of its super
-    categories.
+    This is used when a category `C` defines some additional structure
+    but not an homset category of its own. Indeed, unlike for
+    covariant functorial constructions, we cannot represent the homset
+    category of `C` by just the join of the homset categories of its
+    super categories.
 
     EXAMPLES::