[gtk+] Scrollbar: grammar fix for previous commit

[Daniel Boles <dboles src gnome org>]

commit bb4aaa8bbfc78373fb5c341d0e4731585296630f
Author: Daniel Boles <dboles src gnome org>
Date:   Tue Mar 21 00:06:50 2017 +0000

    Scrollbar: grammar fix for previous commit

 gtk/gtkscrollbar.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkscrollbar.c b/gtk/gtkscrollbar.c
index b09bf13..d999673 100644
--- a/gtk/gtkscrollbar.c
+++ b/gtk/gtkscrollbar.c
@@ -49,8 +49,8 @@
  * #GtkAdjustment:lower and #GtkAdjustment:upper - #GtkAdjustment:page-size. The
  * #GtkAdjustment:page-size represents the size of the visible scrollable area.
  * The fields #GtkAdjustment:step-increment and #GtkAdjustment:page-increment
- * fields are added or subtracted to the #GtkAdjustment:value when the user asks
- * to move by a step (using e.g. the cursor arrow keys or, if present, the
+ * fields are added to or subtracted from the #GtkAdjustment:value when the user
+ * asks to move by a step (using e.g. the cursor arrow keys or, if present, the
  * stepper buttons) or by a page (using e.g. the Page Down/Up keys).
  *
  * # CSS nodes