ubuiltins.bytes: Clarify range up to 255.

Be consistent and use <= for both. A bit more intuitive because the number 256 cannot be used in bytes objects.

src/ubuiltins/__init__.py

@@ -138,8 +138,8 @@ class bytes:
 
     def __init__(self, *args):
         """
-        Returns a new “bytes” object, which is an immutable sequence of integers
-        in the range ``0 <= x < 256``.
+        Returns a new ``bytes`` object, which is an immutable sequence of integers
+        in the range ``0 <= x <= 255``.
         """