Mention that lists can be stored in sets after freezing
Mention that lists can be stored in sets after freezing

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MOS_MIGRATED_REVID=135472917

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