patch 8.1.0528: various typos in comments

Problem:    Various typos in comments.
Solution:   Fix the typos.
diff --git a/src/vim.h b/src/vim.h
index 7a66ab0..be86c6b 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -1270,7 +1270,7 @@
     EVENT_BUFWRITECMD,		// write buffer using command
     EVENT_BUFWRITEPOST,		// after writing a buffer
     EVENT_BUFWRITEPRE,		// before writing a buffer
-    EVENT_CMDLINECHANGED,	// command line was modified*/
+    EVENT_CMDLINECHANGED,	// command line was modified
     EVENT_CMDLINEENTER,		// after entering the command line
     EVENT_CMDLINELEAVE,		// before leaving the command line
     EVENT_CMDUNDEFINED,		// command undefined