Update README.md

replace latex with ascii equation

README.md

@@ -50,7 +50,7 @@ We evaluated FalconLite against benchmarks that are specifically designed to ass
 | [Question Answering with Long Input Texts](https://nyu-mll.github.io/quality/) | 46.9% | 40.8% |
 
 ### Performance ###
-**metrics** = the average number of generated tokens per second (TPS) = $\frac{nb-generated-tokens}{end-to-end-response-time} $
+**metrics** = the average number of generated tokens per second (TPS) = `nb-generated-tokens` / `end-to-end-response-time`
 
 The `end-to-end-response-time` = when the last token is generated - when the inference request is received