bpo-29535: Remove promize about hash randomization of datetime objects. (GH-15269)

(cherry picked from commit e9c90aa43144b0be1e4e393e8cb549573437a5da)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
diff --git a/Doc/reference/datamodel.rst b/Doc/reference/datamodel.rst
index fa47bf1..1dd8e42 100644
--- a/Doc/reference/datamodel.rst
+++ b/Doc/reference/datamodel.rst
@@ -1445,8 +1445,8 @@
 
    .. note::
 
-      By default, the :meth:`__hash__` values of str, bytes and datetime
-      objects are "salted" with an unpredictable random value.  Although they
+      By default, the :meth:`__hash__` values of str and bytes objects are
+      "salted" with an unpredictable random value.  Although they
       remain constant within an individual Python process, they are not
       predictable between repeated invocations of Python.
 
diff --git a/Doc/using/cmdline.rst b/Doc/using/cmdline.rst
index 6bc440f..50143f2 100644
--- a/Doc/using/cmdline.rst
+++ b/Doc/using/cmdline.rst
@@ -302,7 +302,7 @@
    randomization is enabled by default.
 
    On previous versions of Python, this option turns on hash randomization,
-   so that the :meth:`__hash__` values of str, bytes and datetime
+   so that the :meth:`__hash__` values of str and bytes objects
    are "salted" with an unpredictable random value.  Although they remain
    constant within an individual Python process, they are not predictable
    between repeated invocations of Python.
@@ -618,7 +618,7 @@
 .. envvar:: PYTHONHASHSEED
 
    If this variable is not set or set to ``random``, a random value is used
-   to seed the hashes of str, bytes and datetime objects.
+   to seed the hashes of str and bytes objects.
 
    If :envvar:`PYTHONHASHSEED` is set to an integer value, it is used as a fixed
    seed for generating the hash() of the types covered by the hash