Update Crystal's skip_patterns

lib/docs/scrapers/crystal.rb

@@ -20,8 +20,10 @@ module Docs
     html_filters.push 'crystal/entries', 'crystal/clean_html'
 
     options[:skip_patterns] = [
-      %r{\ACrystal/System/},
+      %r{\ALibLLVM\.html\z},
+      %r{\ACrystal/System(/|\.html\z)},
       %r{\ACrystal/PointerPairingHeap/},
+      %r{\AFiber/ExecutionContext/Scheduler.html\z},
       %r{\AIO/Evented.html\z},
       %r{\ARegex/PCRE2.html\z}
     ]