fix(autoformat): make buf part of the autocmd group name

lua/plugins/lsp/format.lua

@@ -26,7 +26,7 @@ end
 function M.on_attach(client, buf)
   if client.supports_method("textDocument/formatting") then
     vim.api.nvim_create_autocmd("BufWritePre", {
-      group = vim.api.nvim_create_augroup("LspFormat", {}),
+      group = vim.api.nvim_create_augroup("LspFormat." .. buf, {}),
       buffer = buf,
       callback = function()
         if M.autoformat then