feat(AstroNvim): add new `update_notification` option with description

lua/lazy_setup.lua

@@ -8,6 +8,7 @@ require("lazy").setup({
       maplocalleader = ",", -- This ensures the localleader key must be configured before Lazy is set up
       icons_enabled = true, -- Set to false to disable icons (if no Nerd Font is available)
       pin_plugins = nil, -- Default will pin plugins when tracking `version` of AstroNvim, set to true/false to override
+      update_notifications = true, -- Enable/disable notification about running `:Lazy update` twice to update pinned plugins
     },
   },
   { import = "community" },