[gcompris] minor: mining: update comment to fit my "standard"

[Bruno Coudoin <bcoudoin src gnome org>]

commit 10194b8b1954949a3f699a1852da77a395c23a42
Author: Peter Albrecht <pa-dev gmx de>
Date:   Fri Sep 21 15:54:10 2012 +0200

    minor: mining: update comment to fit my "standard"

 src/mining-activity/mining.py |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)
---
diff --git a/src/mining-activity/mining.py b/src/mining-activity/mining.py
index ed5333c..d509cbc 100644
--- a/src/mining-activity/mining.py
+++ b/src/mining-activity/mining.py
@@ -594,11 +594,12 @@ class Viewport:
 
 
   def __on_scroll(self, item, target_item, event = None):
-    """ Called at scroll (= zoom) events """
-
-    # item - The element connected with this callback function
-    # target_item - The element under the cursor
-    # event  - gtk.gdk.Event
+    """
+    Called at scroll (= zoom) events
+      item - The element connected with this callback function
+      target_item - The element under the cursor
+      event  - gtk.gdk.Event
+    """
 
     # ignore input while game paused
     if self.is_game_paused():