Update changelog wording

Author: chinyeungli

docs/CHANGELOG.rst

@@ -2,7 +2,7 @@
 
     Release 2.0.3
 
-    * Fix the usage of using genattrib.py on Windows OS
+    * Fix the bug of using genattrib.py on Windows OS
     * Display version when running about.py, genabout.py and genattrib.py