[gnome-devel-docs] HIG: fix typo in Makefile

[Allan Day <allanday src gnome org>]

commit 9a9abb4841671c08bc754f76a2b888db7f18c7f1
Author: Allan Day <allanpday gmail com>
Date:   Fri Sep 25 11:22:54 2015 +0100

    HIG: fix typo in Makefile
    
    An incorrect file name was preventing an image from being picked up.

 hig/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/hig/Makefile.am b/hig/Makefile.am
index c6731bf..6670dda 100644
--- a/hig/Makefile.am
+++ b/hig/Makefile.am
@@ -15,7 +15,7 @@ HELP_FILES = \
        dialogs.page \
        display-compatibility.page \
        drop-down-lists.page \
-       empty-placeholders.page \
+       empty-placeholder.page \
        grids.page \
        header-bar-menus.page \
        header-bars.page \