Update LICENSE.md

Author: damieng

Diff for: LICENSE.md

@@ -2,7 +2,7 @@ The bulk of this project is Copyright MongoDB Inc. and licenced under the Apache
 
 Some portions required to integrate with Entity Framework Core are copyright .NET Foundation via the MIT licence.
 
-Each file clearly indicates which licence applies at the top of the file.
+More information can be found in [third party notices](THIRD-PARTY-NOTICES) or the header in each file.
 
 ---