patch 8.2.4928: various white space and cosmetic mistakes

Problem:    Various white space and cosmetic mistakes.
Solution:   Change spaces to tabs, improve comments.
diff --git a/src/highlight.c b/src/highlight.c
index 3f46a07..75a310f 100644
--- a/src/highlight.c
+++ b/src/highlight.c
@@ -2356,7 +2356,7 @@
     guicolor_T
 gui_get_color_cmn(char_u *name)
 {
-    int         i;
+    int		i;
     guicolor_T  color;
 
     struct rgbcolor_table_S {