   ## Example
 
       # In ~/.iex.exs
-      use_if_available Phoenix.HTML
+      use_if_available(Phoenix.HTML)
 
   """
   @doc since: "1.7.0"

      value = 13

      # in the shell
      iex(1)> import_file "~/file.exs"
      13
      iex(2)> value
      13

  expanded:

      # This raises a File.Error if ~/.iex.exs doesn't exist.
      if "~/.iex.exs" |> Path.expand() |> File.exists?() do
        import_file("~/.iex.exs")
      end

  This macro addresses this issue by checking if the file exists or not
