Soften language about comparison interpretation

docs/ability.md

@@ -2,8 +2,7 @@
 
 Select two models to compare their abilities. The generated histogram
 represents the distribution of the difference in estimated model
-abilities: the probability that Model 1 is stronger than to Model
-2. In the figure:
+abilities. In the figure:
 
 * The dashed vertical line is the median.
 * The shaded region demarcates the chosen [highest density