Align tokenizer_config chat template with docs.mistral.ai chat template

As others mentioned, there is a subtle difference between chat templates:
[https://huggingface.co/mistralai/Mistral-7B-Instruct-v0.1/discussions/53](https://huggingface.co/mistralai/Mistral-7B-Instruct-v0.1/discussions/53)

This edit aligns with:
[https://docs.mistral.ai/llm/mistral-instruct-v0.1#chat-template](https://docs.mistral.ai/llm/mistral-instruct-v0.1#chat-template)
[https://docs.mistral.ai/usage/guardrailing#appendix](https://docs.mistral.ai/usage/guardrailing#appendix)

If accepted, model card should be modified accordingly.

tokenizer_config.json

@@ -29,7 +29,7 @@
   },
   "additional_special_tokens": [],
   "bos_token": "<s>",
-  "chat_template": "{{ bos_token }}{% for message in messages %}{% if (message['role'] == 'user') != (loop.index0 % 2 == 0) %}{{ raise_exception('Conversation roles must alternate user/assistant/user/assistant/...') }}{% endif %}{% if message['role'] == 'user' %}{{ '[INST] ' + message['content'] + ' [/INST]' }}{% elif message['role'] == 'assistant' %}{{ message['content'] + eos_token + ' ' }}{% else %}{{ raise_exception('Only user and assistant roles are supported!') }}{% endif %}{% endfor %}",
+  "chat_template": "{{ bos_token }}{% for message in messages %}{% if (message['role'] == 'user') != (loop.index0 % 2 == 0) %}{{ raise_exception('Conversation roles must alternate user/assistant/user/assistant/...') }}{% endif %}{% if message['role'] == 'user' %}{{ '[INST] ' + message['content'] + ' [/INST] ' }}{% elif message['role'] == 'assistant' %}{{ message['content'] + eos_token }}{% else %}{{ raise_exception('Only user and assistant roles are supported!') }}{% endif %}{% endfor %}",
   "clean_up_tokenization_spaces": false,
   "eos_token": "</s>",
   "legacy": true,