[gegl] Small typo corrected

[Marco Ciampa <marcoc src gnome org>]

commit 0468c6a24ff252161f956b4346772277c936ab8b
Author: Marco Ciampa <ciampix libero it>
Date:   Tue Apr 21 08:57:35 2015 +0200

    Small typo corrected

 operations/common/color-reduction.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/operations/common/color-reduction.c b/operations/common/color-reduction.c
index b915534..d67b732 100644
--- a/operations/common/color-reduction.c
+++ b/operations/common/color-reduction.c
@@ -509,7 +509,7 @@ gegl_op_class_init (GeglOpClass *klass)
     "title",       _("Color Reduction"),
     "categories",  "dither",
     "description", _("Reduce the number of colors in the image, by reducing "
-                     "the bits per channel (colors and alpha), different dithering methods"
+                     "the bits per channel (colors and alpha). Different dithering methods "
                      "can be specified to counteract quantization induced banding."),
     "reference-composition", composition,
     NULL);