Clarify the zip example from the actions documentation.
Clarify the zip example from the actions documentation.

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MOS_MIGRATED_REVID=93305006

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