message: Added BlockSpacer as a related component
  Divider uses both horizontal and vertical orientation. Makes sense to add blockspacer too.
diff: ## Related components
  -- [InlineSpacer](https://github.com/Shopify/checkout-web/tree/master/packages/checkout-ui-extensions/src/components/InlineSpacer): Controls vertical margin.
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  +- [BlockSpacer](https://github.com/Shopify/checkout-web/tree/master/packages/checkout-ui-extensions/src/components/BlockSpacer): Controls vertical margin.
  +- [InlineSpacer](https://github.com/Shopify/checkout-web/tree/master/packages/checkout-ui-extensions/src/components/InlineSpacer): Controls horizontal margin.
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