Use updated native GitHub markdown Note admonition (#16274)

[skip ci] Use updated native GitHub markdown `Note` admonition

- Follows #15443

GitHub will render it with an icon and color the blockquote. The docs: https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax#alerts

Signed-off-by: Yarden Shoham <git@yardenshoham.com>

doc/design/monorepo.md

@@ -1,6 +1,7 @@
 # Why is Babel a monorepo?
 
-> **Note** We don't use `lerna` to manage packages inside the monorepo, but yarn workspaces with an additional [custom plugin](https://github.com/nicolo-ribaudo/yarn-plugin-babel-release-tool).
+> [!NOTE]
+> We don't use `lerna` to manage packages inside the monorepo, but yarn workspaces with an additional [custom plugin](https://github.com/nicolo-ribaudo/yarn-plugin-babel-release-tool).
 
 Juggling a multimodule project over multiple repos is like trying to teach a newborn baby how to
 ride a bike.

eslint/babel-eslint-plugin-development/README.md

@@ -26,7 +26,8 @@ Then, load the plugin in your `.eslintrc` configuration file. You can omit the `
 
 ## Supported Rules
 
-> **Note** Rules marked with :wrench: are autofixable.
+> [!NOTE]
+> Rules marked with :wrench: are autofixable.
 
 * `@babel/development/no-deprecated-clone` (:wrench:): Disallows using the deprecated
   `t.clone(node)` and `t.cloneDeep(node)` methods from `@babel/types`. Those