patch 8.1.2275: using "seesion" looks like a mistake

Problem:    Using "seesion" looks like a mistake.
Solution:   Use an underscore to make the function sort first.

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2275,
 /**/
     2274,
 /**/