Fix notice for LightJson - to document where it came it from:

Added to ILSpy via 79835afca4 on Nov 30, 2017 as a copy from https://github.com/DotNetAnalyzers/StyleCopAnalyzers/tree/master/StyleCop.Analyzers/StyleCop.Analyzers/LightJson with the following attribution in the respective repo's original commit fc1cf57e02 (diff-9879d6db96fd29134fc802214163b95aR49) (MIT)

Confusion of (old) license notice came from license header in source files.

doc/third-party-notices.txt

@@ -354,9 +354,29 @@ https://opensource.org/licenses/MIT
 License Notice for LightJson (part of ICSharpCode.Decompiler)
 ---------------------------
 
-Copyright (c) Tunnel Vision Laboratories, LLC. All Rights Reserved.
+https://github.com/MarcosLopezC/LightJson/blob/master/LICENSE.txt
 
-Licensed under the Apache License, Version 2.0.
+The MIT License (MIT)
+
+Copyright (c) 2018 Marcos López C.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
 
 
 License Notice for Mono.Cecil (part of ILSpy)