Add type checker names to spelling dictionary

Author: adamtheturtle

spelling_private_dict.txt

@@ -79,6 +79,7 @@ plugins
 png
 pragma
 py
+pyrefly
 pyright
 pytest
 readme
@@ -97,6 +98,7 @@ todo
 traceback
 travis
 txt
+ty
 unmocked
 untyped
 url