[docs] Fix anchor link in customization #37004
Merged
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This header was changed in #31997, but it doesn't seem to need to be a h3. h2 seems enough and retains the anchor link.
e.g. of a broken anchor link: https://marmelab.com/react-admin/BooleanField.html#sx-css-api
Noticed in marmelab/react-admin#8857