## Problem
`extra_filetypes = { 'diff' }` enables highlighting in telescope,
snacks, and fzf-lua git preview buffers, but this was not documented
beyond a brief mention of `.diff` files.
## Solution
Add a README FAQ entry and expand the vimdoc `extra_filetypes` field
description to mention specific pickers and which previewer styles are
supported.
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|---|---|---|
| .. | ||
| diffs.nvim.txt | ||