Fix presentation of dataclasses' unsafe_hash default value (#116532)

Co-authored-by: Adam Turner <[email protected]>

Author: Viicos

Doc/library/dataclasses.rst

@@ -121,8 +121,11 @@ Module contents
      :meth:`!__le__`, :meth:`!__gt__`, or :meth:`!__ge__`, then
      :exc:`TypeError` is raised.
 
-   - *unsafe_hash*: If ``False`` (the default), a :meth:`~object.__hash__` method
-     is generated according to how *eq* and *frozen* are set.
+   - *unsafe_hash*: If true, force ``dataclasses`` to create a
+     :meth:`~object.__hash__` method, even though it may not be safe to do so.
+     Otherwise, generate a :meth:`~object.__hash__` method according to how
+     *eq* and *frozen* are set.
+     The default value is ``False``.
 
      :meth:`!__hash__` is used by built-in :meth:`hash`, and when objects are
      added to hashed collections such as dictionaries and sets.  Having a