[gimp-web/testing] Add hint for expanding 'Folders' in asset folders tutorial

[Pat David <patdavid src gnome org>]

commit 8081f666a1c9f809e2e9c4b97d7ab9b749e8eec0
Author: Pat David <patdavid gmail com>
Date:   Wed Jan 25 12:47:08 2017 -0600

    Add hint for expanding 'Folders' in asset folders tutorial

 content/tutorials/Asset_Folders/index.md |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/content/tutorials/Asset_Folders/index.md b/content/tutorials/Asset_Folders/index.md
index b0384b2..a15d9da 100644
--- a/content/tutorials/Asset_Folders/index.md
+++ b/content/tutorials/Asset_Folders/index.md
@@ -15,7 +15,7 @@ A common question from new users is how to install these assets, so we are going
 ## Finding Asset Folders
 
 GIMP searches for these assets in locations specified in the _Preferences_ dialog.
-To open it go to:
+To open it, go to:
 
 <div class="MenuCmd"><span>Edit → Preferences</span></div>
 
@@ -25,7 +25,7 @@ Which will open the GIMP preferences dialog:
 <img src='{filename}GIMP-Preferences.png' alt='GIMP Preferences Dialog'>
 </figure>
 
-Expanding the **Folders** in the left pane of the dialog will expose the various asset folder locations:
+Expanding the **Folders** (click the "+") in the left pane of the dialog will expose the various asset 
folder locations:
 
 <figure>
 <img src='{filename}GIMP-Preferences-Folders.png' alt='GIMP Preferences Folders Dialog'>