docs: clarify that multiple overrides for a variant create unions (#1551)
docs: clarify that multiple overrides for a variant create unions (#1551)

* docs: clarify that multiple overrides for a variant create unions

* Update website/docs/advanced/feature-toggle-variants.md

Co-authored-by: sighphyre <ac147e41ecc7493e450909a975d58205736c13ba@gmail.com>
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