Document new blaze query 'visible' filter
Document new blaze query 'visible' filter

Follow-up to []

RELNOTES: N/A

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