Wrap lines of asciidoc and markdown files

Many projects use markdown or asciidoc and write "endless" lines. That's
annoying on it's own, but not having them wrapped is even more annoying.
So, this change simply wraps these lines to make them more accessible
for me.

.config/nvim/lua/config/defaults.lua

@@ -135,6 +135,26 @@ vim.api.nvim_create_autocmd("FileType", {
 		vim.opt_local.tabstop = 4
 	end,
 })
+-- markdown
+vim.api.nvim_create_autocmd("FileType", {
+	pattern = "markdown",
+	group = configgroup,
+	callback = function()
+		vim.opt_local.shiftwidth = 4
+		vim.opt_local.tabstop = 4
+		vim.opt.wrap = true
+	end,
+})
+-- asciidoc
+vim.api.nvim_create_autocmd("FileType", {
+	pattern = "asciidoc",
+	group = configgroup,
+	callback = function()
+		vim.opt_local.shiftwidth = 4
+		vim.opt_local.tabstop = 4
+		vim.opt.wrap = true
+	end,
+})
 -- i3config
 vim.api.nvim_create_autocmd("FileType", {
 	pattern = "i3config",