Merge pull request dotnet/coreclr#18689 from BruceForstall/UpdateArmBuildDocumentation
authorBruce Forstall <brucefo@microsoft.com>
Thu, 28 Jun 2018 19:20:31 +0000 (12:20 -0700)
committerGitHub <noreply@github.com>
Thu, 28 Jun 2018 19:20:31 +0000 (12:20 -0700)
Update ARM/Linux build directions

Commit migrated from https://github.com/dotnet/coreclr/commit/1ad9c94ef5e541e9c8ac29606515d6f54e0e445c


Trivial merge