--- Remove an existing mapping. --- Examples --- vim.keymap.del('n', 'lhs') --- --- vim.keymap.del({'n', 'i', 'v'}, 'w', { buffer = 5 }) --- ---@param opts table|nil A table of optional arguments: --- - buffer: (number or boolean) Remove a mapping from the given buffer. --- When "true" or 0, use the current buffer. ---@see |vim.keymap.set()|