Add augroup to autocommand

lua/autocommands.lua

@@ -1,6 +1,9 @@
+local markdown = vim.api.nvim_create_augroup("markdown", { clear = true })
+
 -- Recognize .md as pandoc
 vim.api.nvim_create_autocmd({"BufEnter", "BufWinEnter"}, {
   pattern = {"*.md", },
+  group = markdown,
   callback =  function()
     vim.o.filetype = 'pandoc'
     vim.o.spell = true
@@ -15,6 +18,7 @@ vim.api.nvim_create_autocmd({"BufEnter", "BufWinEnter"}, {
 -- French markdown files
 vim.api.nvim_create_autocmd({"BufEnter", "BufWinEnter"}, {
   pattern = {"*-fr.md", },
+  group = markdown,
   callback =  function()
     vim.o.spelllang = 'fr'
   end
@@ -23,6 +27,7 @@ vim.api.nvim_create_autocmd({"BufEnter", "BufWinEnter"}, {
 -- Spell shortcuts
 vim.api.nvim_create_autocmd({"OptionSet"}, {
   pattern = { "spell" },
+  group = markdown,
   callback = function()
     if vim.o.spell == true then
       vim.keymap.set("n", "<Leader>i", "mz[s1z=`z", {noremap = true, silent = true})