Update external dependencies documentation to mention the --artifact argument to generate_workspace.
Update external dependencies documentation to mention the --artifact argument to generate_workspace.

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MOS_MIGRATED_REVID=115367724

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