Update bazel docs to (more) accurately state allowed package names.
Update bazel docs to (more) accurately state allowed package names.

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MOS_MIGRATED_REVID=133257383

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