Update README.md

Author: g-husam

docs/README.md

@@ -36,7 +36,7 @@ These improvements only account for checkpoint save efficiency, representing a "
 Any job interruptions will also benefit from the improved checkpoint recovery times.
 
 While [ML runtime goodput](https://cloud.google.com/blog/products/ai-machine-learning/goodput-metric-as-measure-of-ml-productivity) is important, we focus on overall job time as an end-to-end metric, as it is simpler and allows for straightforward _total_ cost comparisons.
-Goodput can be misleading if improvements to unproductive time actually worsen productive time, and the change in total evaluation period (job time) is not taken into account.
+Runtime goodput alone can be misleading if improvements to unproductive time actually worsen productive time, and the change in total evaluation period (job time) is not taken into account.
 
 ## Design Philosophy