[gnome-nibbles/arnaudb/modernize-code] Improve a key description.

[Arnaud B. <arnaudb src gnome org>]

commit 92ca54cd72ad0b4bfc2f99eafbcd27aa6e06f711
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Fri May 29 10:12:11 2020 +0200

    Improve a key description.

 data/org.gnome.Nibbles.gschema.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/org.gnome.Nibbles.gschema.xml b/data/org.gnome.Nibbles.gschema.xml
index e648be3..21390ce 100644
--- a/data/org.gnome.Nibbles.gschema.xml
+++ b/data/org.gnome.Nibbles.gschema.xml
@@ -44,7 +44,7 @@
       <default>2</default>
       <range min="1" max="4"/>
       <summary>Worms movement speed</summary>
-      <description>Worms movement speed.</description>
+      <description>The speed of the worms, where ‘1’ means “fast” and ‘4’ “slow”.</description>
     </key>
     <key name="sound" type="b">
       <default>true</default>