doc updates

README.md

@@ -130,7 +130,6 @@ abstract = library <= tree
 my_pattern.place(abstract, ...)
 
 # or
-
 my_pattern.place(library << make_tree(...), ...)
 ```
 
@@ -169,8 +168,6 @@ has_input = ('input' in pattern)   # Error!
 ```
 
 
-
-
 ## TODO
 
 * Better interface for polygon operations (e.g. with `pyclipper`)

masque/shapes/shape.py

@@ -30,7 +30,7 @@ class Shape(PositionableImpl, Rotatable, Mirrorable, Copyable, Scalable,
     """
     Class specifying functions common to all shapes.
     """
-    __slots__ = ()      # Children should use AutoSlots
+    __slots__ = ()      # Children should use AutoSlots or set slots themselves
 
     def __copy__(self) -> Self:
         cls = self.__class__