enh(treesitter): add help into ensure_installed

closes https://github.com/nvim-lua/kickstart.nvim/issues/38

init.lua

@@ -216,7 +216,7 @@ vim.keymap.set('n', '<leader>sd', require('telescope.builtin').diagnostics, { de
 -- See `:help nvim-treesitter`
 require('nvim-treesitter.configs').setup {
   -- Add languages to be installed here that you want installed for treesitter
-  ensure_installed = { 'c', 'cpp', 'go', 'lua', 'python', 'rust', 'typescript' },
+  ensure_installed = { 'c', 'cpp', 'go', 'lua', 'python', 'rust', 'typescript', 'help' },
 
   highlight = { enable = true },
   indent = { enable = true },