patch 8.1.2243: typos in comments

Problem:    Typos in comments.
Solution:   Fix the typos. (Dominique Pelle, closes #5160)  Also adjust
            formatting a bit.
diff --git a/src/message.c b/src/message.c
index 8af5d7b..4a3389c 100644
--- a/src/message.c
+++ b/src/message.c
@@ -1616,7 +1616,7 @@
 msg_outtrans_special(
     char_u	*strstart,
     int		from,	// TRUE for lhs of a mapping
-    int		maxlen) // screen columns, 0 for unlimeted
+    int		maxlen) // screen columns, 0 for unlimited
 {
     char_u	*str = strstart;
     int		retval = 0;