Fix typo

STORY.md

@@ -180,7 +180,7 @@ The base model achieved a mean TER of 99.67%, with median TER at exactly 100%. I
 
 **After SFT:**
 
-Supervised fine-tuning reduced median TER to median 60.48%, a ~39 percentage point improvement. The 25th percentile reached 52.81% TER, meaning a quarter of predictions got nearly half the characters right.
+Supervised fine-tuning reduced median TER to 60.48%, a ~39 percentage point improvement. The 25th percentile reached 52.81% TER, meaning a quarter of predictions got nearly half the characters right.
 
 Qualitative analysis of the best predictions reveals what the model learned: