patch 8.2.2440: documentation based on patches is outdated

Problem:    Documentation based on patches is outdated.
Solution:   Add changes to documentation in a patch.
diff --git a/src/version.c b/src/version.c
index 0ef8006..c5074c2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2440,
+/**/
     2439,
 /**/
     2438,