[LyX/2.1.x] stdmenus.inc: add PDF forms example to Help menu

[Uwe Stöhr]

commit e682e73348f21fc3899fa2cc986cc78cb65d220f
Author: Uwe Stöhr <uwesto...@lyx.org>
Date:   Mon May 11 01:05:44 2015 +0200

    stdmenus.inc: add PDF forms example to Help menu
    
    I forgot that when I added PDF forms.

diff --git a/lib/ui/stdmenus.inc b/lib/ui/stdmenus.inc
index 49821df..a71dc89 100644
--- a/lib/ui/stdmenus.inc
+++ b/lib/ui/stdmenus.inc
@@ -608,6 +608,7 @@ Menuset
                Item "Linguistics|L" "help-open linguistics"
                Item "Multilingual Captions|C" "help-open MultilingualCaptions"
                Item "PDF comments|D" "help-open PDF-comment"
+               Item "PDF forms|o" "help-open PDF-form"
                Item "Risk and Safety Statements|R" "help-open R-S-statements"
                Item "Sweave|S" "help-open sweave"
                Item "XY-pic|X" "help-open xypic"