Fix typo in MixProjectCache documentation

Author: lukaszsamson

apps/language_server/lib/language_server/mix_project_cache.ex

@@ -1,6 +1,6 @@
 defmodule ElixirLS.LanguageServer.MixProjectCache do
   @moduledoc """
-  This module serves as a caching layer guarantying a safe access to Mix.Project functions. Note that
+  This module serves as a caching layer guaranteeing a safe access to Mix.Project functions. Note that
   Mix.Project functions cannot be safely called during a build as dep mix projects are being pushed and
   popped
   """