patch 8.2.3825: various comments could be improved

Problem:    Various comments could be improved.
Solution:   Improve the comments.
diff --git a/src/gui_motif.c b/src/gui_motif.c
index 67f9c63..d79a414 100644
--- a/src/gui_motif.c
+++ b/src/gui_motif.c
@@ -3995,7 +3995,7 @@
 }
 
 /*
- * Synchronize all gui elements, which are dependant upon the
+ * Synchronize all gui elements, which are dependent upon the
  * main text font used. Those are in esp. the find/replace dialogs.
  * If you don't understand why this should be needed, please try to
  * search for "pi\xea\xb6\xe6" in iso8859-2.