docs: Clarify that $npm_package.publish requires publishable = True

[fweikert]

This fact is already mentioned further down in the docs, but this commit makes it more apparent when only scanning the summary.

The default value for publishable was changed in #1683.

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[aspect-workflows]

Test

1 test target passed

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//docs:update_6_test [k8-fastbuild]                 41ms

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e2e/bzlmod

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e2e/gyp_no_install_script

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e2e/js_image_oci

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e2e/npm_link_package

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e2e/npm_link_package-esm

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e2e/npm_translate_lock

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e2e/npm_translate_lock_empty

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e2e/npm_translate_lock_multi

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e2e/npm_translate_lock_partial_clone

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e2e/npm_translate_lock_replace_packages

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e2e/npm_translate_lock_subdir_patch

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e2e/npm_translate_package_lock

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e2e/npm_translate_yarn_lock

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e2e/package_json_module

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e2e/pnpm_lockfiles

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e2e/pnpm_workspace

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e2e/pnpm_workspace_rerooted

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e2e/repo_mapping

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e2e/rules_foo

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e2e/vendored_node

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[alexeagle]

thank you!