Document that Visual Studio is now required for building Bazel.
Document that Visual Studio is now required for building Bazel.

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MOS_MIGRATED_REVID=126044624

davidzchen/bazel-website,davidzchen/bazel-website,bazelbuild/bazel-website,bazelbuild/bazel-website,davidzchen/bazel-website,davidzchen/bazel-website,bazelbuild/bazel-website