MAINT: Update comment (#3311)

JBIG2Decode is now implemented, so comment was outdated.

---------

Co-authored-by: Stefan <96178532+stefan6419846@users.noreply.github.com>

Author: j-t-1

pypdf/generic/_data_structures.py

@@ -979,7 +979,7 @@ def hash_bin(self) -> int:
             Hash considering type and value.
 
         """
-        # use of _data to prevent errors on non decoded stream such as JBIG2
+        # Use _data to prevent errors on non-decoded streams.
         return hash((super().hash_bin(), self._data))
 
     def get_data(self) -> bytes: