mini.ai: move to extras. Add default textobjects to treesitter, improved comment to t = false

lua/lazyvim/plugins/extras/coding/mini-ai.lua

@@ -74,8 +74,10 @@ return {
         n_lines = 500,
         custom_textobjects = {
 
-          -- see: https://github.com/echasnovski/mini.nvim/issues/474
-          t = false, -- for now, fallback to neovim's builtin tag.
+          -- opt-out: using neovim's text object selection for tags:
+          t = false,
+          -- opt-in: use the following override in the "opts" function of your spec:
+          -- opts.custom_textobjects.t = nil -- opt-in to mini.ai's tag textobject
 
           o = ai.gen_spec.treesitter({
             a = { "@block.outer", "@conditional.outer", "@loop.outer" },