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/highlight.c b/src/highlight.c
index 1333362..3c0eb19 100644
--- a/src/highlight.c
+++ b/src/highlight.c
@@ -3682,7 +3682,8 @@
 	return -1;
     if (id < -1 || id == 0)
     {
-	semsg(_("E799: Invalid ID: %d (must be greater than or equal to 1)"), id);
+	semsg(_("E799: Invalid ID: %d (must be greater than or equal to 1)"),
+									   id);
 	return -1;
     }
     if (id != -1)
@@ -4346,7 +4347,7 @@
  * After end, check for start/end of next match.
  * When another match, have to check for start again.
  * Watch out for matching an empty string!
- * Return the udpated search_attr.
+ * Return the updated search_attr.
  */
     int
 update_search_hl(