[Feature Request]: Prompt Syntax Documentation

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I do not know what syntax I can use when typing a prompt in, e.g. weighting multiple prompts, negative weights etc.

I would like documentation and/or tool-tips that explain what syntax is supported for modifying prompt strings.

These do not seem to be clearly documented anywhere currently, I have only seen occasional reference to this syntax in other issues and comments on the github - e.g. use of | symbols, : and # or even [] to modify weights and embeddings.