Add Button migration instructions (#10295)

### WHY are these changes introduced? Part of #10161 ### WHAT is this pull request doing? Adds instructions to run the `Button` migration
Shopify · Sep 6, 2023 · 37670dd · 37670dd
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diff --git a/documentation/guides/migrating-from-v11-to-v12.md b/documentation/guides/migrating-from-v11-to-v12.md
@@ -62,7 +62,9 @@ Polaris v12.0.0 ([full release notes](https://github.com/Shopify/polaris/release
 
 - connectedDisclosure: [See the updated split example](https://polaris.shopify.com/components/actions/button)
 
-// TODO - Boolean prop to tone, variant migration
+- Boolean props to `variant` and `tone`
+
+`npx @shopify/polaris-migrator v12-react-update-button-component <path>`
 
 **ButtonGroup**