[gimp-help-2] Correct PostScript spelling, fix #776629

[Alexandre Prokoudine <aprokoudine src gnome org>]

commit d1f3fdcda2153f2909255166ea64add7b21410af
Author: Rafael Fontenelle <rafaelff gnome org>
Date:   Mon Jan 16 23:15:43 2017 +0300

    Correct PostScript spelling, fix #776629

 src/glossary/glossary.xml |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/glossary/glossary.xml b/src/glossary/glossary.xml
index e8b1699..ed40875 100644
--- a/src/glossary/glossary.xml
+++ b/src/glossary/glossary.xml
@@ -1905,7 +1905,7 @@
         are supported, each with one of three different image modes: black and
         white, grayscale and color. Uncompressed TIFF images may be 1, 4, 8 or
         24 bits per pixel. TIFF images compressed using the LZW algorithm may
-        be 6, 8 or 24 bits per pixel. Besides Postscript format, TIFF is one
+        be 6, 8 or 24 bits per pixel. Besides PostScript format, TIFF is one
         of the most important formats for preliminary stages of printing. It
         is a high quality file format, which is perfect for images you want to
         import to other programs like FrameMaker or CorelDRAW.