[glib] docs: Remove redundant sentence from g_prefix_error() documentation

[Philip Withnall <pwithnall src gnome org>]

commit ca1aaccbff972f11c07632ba709edf4abc322b34
Author: Philip Withnall <withnall endlessm com>
Date:   Fri Jan 5 19:36:07 2018 +0000

    docs: Remove redundant sentence from g_prefix_error() documentation
    
    Signed-off-by: Philip Withnall <withnall endlessm com>
    Reviewed-by: nobody

 glib/gerror.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/glib/gerror.c b/glib/gerror.c
index a92cbe2..236e528 100644
--- a/glib/gerror.c
+++ b/glib/gerror.c
@@ -705,8 +705,7 @@ g_error_add_prefix (gchar       **string,
  * nothing.
  *
  * If *@err is %NULL (ie: an error variable is present but there is no
- * error condition) then also do nothing. Whether or not it makes sense
- * to take advantage of this feature is up to you.
+ * error condition) then also do nothing.
  *
  * Since: 2.16
  */