patch 8.2.3542: too many comments are old style

Problem:    Too many comments are old style.
Solution:   Change comments to // style. (closes #9021)
diff --git a/src/version.c b/src/version.c
index b4e342d..f449532 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3542,
+/**/
     3541,
 /**/
     3540,