[atk] Fix doc of atk_text_get_text_before_offset.

[Li Yuan <liyuan src gnome org>]

commit 4cca0bfe4cbcb03abbec884f2361b9fc714cc1dd
Author: Li Yuan <li yuan sun com>
Date:   Mon May 30 14:19:20 2011 +0800

    Fix doc of atk_text_get_text_before_offset.
    
    Bug #551489.

 atk/atktext.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/atk/atktext.c b/atk/atktext.c
index 800cba5..3674aad 100755
--- a/atk/atktext.c
+++ b/atk/atktext.c
@@ -471,16 +471,16 @@ atk_text_get_text_at_offset (AtkText          *text,
  * offset is returned.
  *
  * If the boundary_type is ATK_TEXT_BOUNDARY_WORD_START the returned string
- * is from the word start before the word start before the offset to 
- * the word start before the offset.
+ * is from the word start before the word start before or at the offset to 
+ * the word start before or at the offset.
  *
  * The returned string will contain the word before the offset if the offset
  * is inside a word and will contain the word before the word before the 
  * offset if the offset is not inside a word.
  *
  * If the boundary_type is ATK_TEXT_BOUNDARY_WORD_END the returned string
- * is from the word end before the word end at or before the offset to the 
- * word end at or before the offset.
+ * is from the word end before the word end before the offset to the word
+ * end before the offset.
  *
  * The returned string will contain the word before the offset if the offset
  * is inside a word or if the offset is not inside a word.