gh-87506: Document that json.load*() can raise UnicodeDecodeError (GH-127355)

(cherry picked from commit 15372d0)

Co-authored-by: Srinivas Reddy Thatiparthy (తాటిపర్తి శ్రీనివాస్  రెడ్డి) <thatiparthysreenivas@gmail.com>
Co-authored-by: Erlend Aasland <erlend@python.org>

Author: 2 people

Doc/library/json.rst

@@ -324,6 +324,10 @@ Basic Usage
    :raises JSONDecodeError:
       When the data being deserialized is not a valid JSON document.
 
+   :raises UnicodeDecodeError:
+      When the data being deserialized does not contain
+      UTF-8, UTF-16 or UTF-32 encoded data.
+
    .. versionchanged:: 3.1
 
       * Added the optional *object_pairs_hook* parameter.