docs(readme): make bootstrap snippet works well with lsp (#617)

README.md

@@ -224,7 +224,7 @@ one may use the bootstrapping script. Place the following script into your `init
 ```lua
 do
     -- Specifies where to install/use rocks.nvim
-    local install_location = vim.fs.joinpath(vim.fn.stdpath("data"), "rocks")
+    local install_location = vim.fs.joinpath(vim.fn.stdpath("data") --[[@as string]], "rocks")
 
     -- Set up configuration options related to rocks.nvim (recommended to leave as default)
     local rocks_config = {
@@ -253,22 +253,17 @@ end
 
 -- If rocks.nvim is not installed then install it!
 if not pcall(require, "rocks") then
-    local rocks_location = vim.fs.joinpath(vim.fn.stdpath("cache"), "rocks.nvim")
+    local rocks_location = vim.fs.joinpath(vim.fn.stdpath("cache") --[[@as string]], "rocks.nvim")
 
     if not vim.uv.fs_stat(rocks_location) then
         -- Pull down rocks.nvim
-        vim.fn.system({
-            "git",
-            "clone",
-            "--filter=blob:none",
-            "https://github.com/nvim-neorocks/rocks.nvim",
-            rocks_location,
-        })
+        local url = "https://github.com/nvim-neorocks/rocks.nvim"
+        vim.fn.system({ "git", "clone", "--filter=blob:none", url, rocks_location })
+        -- Make sure the clone was successfull
+        assert(vim.v.shell_error == 0, "rocks.nvim installation failed. Try exiting and re-entering Neovim!")
     end
 
     -- If the clone was successful then source the bootstrapping script
-    assert(vim.v.shell_error == 0, "rocks.nvim installation failed. Try exiting and re-entering Neovim!")
-
     vim.cmd.source(vim.fs.joinpath(rocks_location, "bootstrap.lua"))
 
     vim.fn.delete(rocks_location, "rf")