chore(build): auto-generate vimdoc

doc/lazy.nvim.txt

@@ -73,11 +73,12 @@ You can add the following Lua code to your `init.lua` to bootstrap
         "clone",
         "--filter=blob:none",
         "--single-branch",
+        "--branch=stable", -- remove this if you want to bootstrap to HEAD
         "https://github.com/folke/lazy.nvim.git",
         lazypath,
       })
     end
-    vim.opt.runtimepath:prepend(lazypath)
+    vim.opt.rtp:prepend(lazypath)
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