Remove link to unrelated site (#5548)
Remove link to unrelated site (#5548)

http://www.msbuildexplorer.com/ leads to site which offers "free" keys. This PR removes that link and keeps only link to GitHub repo
sean-gilliam/msbuild,mono/msbuild,mono/msbuild,rainersigwald/msbuild,AndyGerlicher/msbuild,AndyGerlicher/msbuild,mono/msbuild,sean-gilliam/msbuild,cdmihai/msbuild,cdmihai/msbuild,cdmihai/msbuild,AndyGerlicher/msbuild,mono/msbuild,sean-gilliam/msbuild,AndyGerlicher/msbuild,rainersigwald/msbuild,rainersigwald/msbuild,rainersigwald/msbuild,sean-gilliam/msbuild,cdmihai/msbuild