Removing obselute uex file reference comments in code

[alphonsekurian]

Removing obselute uex file reference comments in code. @Petermarcu

[dnfclas]

Hi @alphonsekurian, I'm your friendly neighborhood .NET Foundation Pull Request Bot (You can call me DNFBOT). Thanks for your contribution!

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[stephentoub]

@dotnet-bot Test Innerloop CentOS7.1 Debug Build and Test please (known AV in coreclr)

[stephentoub]

LGTM. Thanks for the cleanup.

@alphonsekurian, can you please sign the CLA? We can merge this once that's done.

[dnfclas]

@alphonsekurian, Thanks for signing the contribution license agreement so quickly! Actual humans will now validate the agreement and then evaluate the PR.

Thanks, DNFBOT;