Correct the release date for 10.1

Author: kwankyu

src/changelogs/sage-10.1.txt

@@ -1,4 +1,4 @@
-Sage 10.1 was released on 2023-08-23. It is available from:
+Sage 10.1 was released on 2023-08-20. It is available from:
 
   * https://www.sagemath.org/download-source.html
 
@@ -376,4 +376,4 @@ Merged in sage-10.1:
 #35884: Matthias Koppe: `sage.{modular,schemes}`: Modularization fixes for imports; update `sage -fiximports`, add relint pattern  [Reviewed by Kwankyu Lee]
 #35903: David Coudert: Add parameter `key` to methods `multiple_edges` and `edge_boundary` [Reviewed by Dima Pasechnik]
 #35935: Lorenz Panny: Add `multiple=` option to `EllipticCurvePoint_field.set_order()` [Reviewed by John Cremona]
-#35969: David Coudert, Dima Pasechnik: Improve method `reverse` for digraphs [Reviewed by Matthias Koppe]
+#35969: David Coudert, Dima Pasechnik: Improve method `reverse` for digraphs [Reviewed by Matthias Koppe]