[3.12] Clarify distinction between datetime module and class in deprecation messages (GH-108073) (#108540)

Clarify distinction between datetime module and class in deprecation messages (GH-108073)
(cherry picked from commit 09343db)

Co-authored-by: Clément Robert <[email protected]>

Author: miss-islington

Modules/_datetimemodule.c

@@ -5145,9 +5145,9 @@ static PyObject *
 datetime_utcnow(PyObject *cls, PyObject *dummy)
 {
     if (PyErr_WarnEx(PyExc_DeprecationWarning,
-        "datetime.utcnow() is deprecated and scheduled for removal in a "
+        "datetime.datetime.utcnow() is deprecated and scheduled for removal in a "
         "future version. Use timezone-aware objects to represent datetimes "
-        "in UTC: datetime.now(datetime.UTC).", 1))
+        "in UTC: datetime.datetime.now(datetime.UTC).", 1))
     {
         return NULL;
     }
@@ -5188,9 +5188,9 @@ static PyObject *
 datetime_utcfromtimestamp(PyObject *cls, PyObject *args)
 {
     if (PyErr_WarnEx(PyExc_DeprecationWarning,
-        "datetime.utcfromtimestamp() is deprecated and scheduled for removal "
+        "datetime.datetime.utcfromtimestamp() is deprecated and scheduled for removal "
         "in a future version. Use timezone-aware objects to represent "
-        "datetimes in UTC: datetime.fromtimestamp(timestamp, datetime.UTC).", 1))
+        "datetimes in UTC: datetime.datetime.fromtimestamp(timestamp, datetime.UTC).", 1))
     {
         return NULL;
     }