docs: Add more documentation (#1174)

lua/lazyvim/plugins/treesitter.lua

@@ -1,5 +1,8 @@
 local load_textobjects = false
 return {
+  -- Treesitter is a new parser generator tool that we can
+  -- use in Neovim to power faster and more accurate
+  -- syntax highlighting.
   {
     "nvim-treesitter/nvim-treesitter",
     version = false, -- last release is way too old and doesn't work on Windows

lua/lazyvim/plugins/ui.lua

@@ -272,7 +272,8 @@ return {
     },
   },
 
-  -- dashboard
+  -- Dashboard. This runs when neovim starts, and is what displays
+  -- the "LAZYVIM" banner.
   {
     "goolord/alpha-nvim",
     event = "VimEnter",

lua/lazyvim/plugins/util.lua

@@ -9,7 +9,9 @@ return {
     end,
   },
 
-  -- session management
+  -- Session management. This saves your session in the background,
+  -- keeping track of open buffers, window arrangement, and more.
+  -- You can restore sessions when returning through the dashboard.
   {
     "folke/persistence.nvim",
     event = "BufReadPre",