Update README.md

Fix [\INST] to [/INST]

README.md

@@ -13,7 +13,7 @@ For full details of this model please read our [release blog post](https://mistr
 
 ## Instruction format
 
-In order to leverage instruction fine-tuning, your prompt should be surrounded by `[INST]` and `[\INST]` tokens. The very first instruction should begin with a begin of sentence id. The next instructions should not. The assistant generation will be ended by the end-of-sentence token id.
+In order to leverage instruction fine-tuning, your prompt should be surrounded by `[INST]` and `[/INST]` tokens. The very first instruction should begin with a begin of sentence id. The next instructions should not. The assistant generation will be ended by the end-of-sentence token id.
 
 E.g.