-Fixed small typo in documentation

git-svn-id: http://svn.osgeo.org/qgis/trunk@12017 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: ersts

src/core/qgsrendercontext.h

@@ -27,7 +27,7 @@ class QPainter;
 /** \ingroup core
  * Contains information about the context of a rendering operation.
  * The context of a rendering operation defines properties such as
- * the conversion ration between screen and map units, the extents /
+ * the conversion ratio between screen and map units, the extents /
  * bounding box to be rendered etc.
  **/
 class CORE_EXPORT QgsRenderContext