convert_tokens_to_string documentation bug
The [documentation](https://huggingface.co/transformers/main_classes/tokenizer.html#transformers.PreTrainedTokenizer.convert_tokens_to_string) states that convert_tokens_to_string would convert _a sequence of token ids in a single string._ 

That is actually not correct as it converts a sequence of tokens. The method that converts a sequence of token ids is the decode method.

Documentation: @sgugger



