Record actual date for start of 3.15 development

Author: AA-Turner

peps/pep-0790.rst

@@ -31,9 +31,12 @@ Release schedule
 The dates below use a 17-month development period that results in a 12-month
 release cadence between feature versions, as defined by :pep:`602`.
 
+Actual:
+
+- 3.15 development begins: Wednesday, 2025-05-07
+
 Expected:
 
-- 3.15 development begins: Tuesday, 2025-05-06
 - 3.15.0 alpha 1: Tuesday, 2025-10-14
 - 3.15.0 alpha 2: Tuesday, 2025-11-18
 - 3.15.0 alpha 3: Tuesday, 2025-12-16