Unified the formatting

modules/tracking/doc/tracking.bib

@@ -91,5 +91,5 @@
   month={June}, 
   pages={1090-1097}, 
   keywords={computer vision;feature extraction;image colour analysis;image representation;image sequences;adaptive color attributes;benchmark color sequences;color features;color representations;computer vision;image description;real-time visual tracking;tracking-by-detection framework;Color;Computational modeling;Covariance matrices;Image color analysis;Kernel;Target tracking;Visualization;Adaptive Dimensionality Reduction;Appearance Model;Color Features;Visual Tracking}, 
- doi={10.1109/CVPR.2014.143},}
- 
+  doi={10.1109/CVPR.2014.143},
+}