[docs] Fix mistral link in mixtral.md (#28143)

Fix mistral link in mixtral.md

docs/source/en/model_doc/mixtral.md

@@ -42,7 +42,7 @@ Mixtral-45B is a decoder-based LM with the following architectural choices:
 
 * Mixtral is a Mixture of Expert (MOE) model with 8 experts per MLP, with a total of 45B paramateres but the compute required is the same as a 14B model. This is because even though each experts have to be loaded in RAM (70B like ram requirement) each token from the hidden states are dipatched twice (top 2 routing) and thus the compute (the operation required at each foward computation) is just 2 X sequence_length. 
 
-The following implementation details are shared with Mistral AI's first model [mistral](~models/doc/mistral):
+The following implementation details are shared with Mistral AI's first model [mistral](mistral):
 * Sliding Window Attention - Trained with 8k context length and fixed cache size, with a theoretical attention span of 128K tokens
 * GQA (Grouped Query Attention) - allowing faster inference and lower cache size.
 * Byte-fallback BPE tokenizer - ensures that characters are never mapped to out of vocabulary tokens.