Update family-plan.md

Update date when sales tax / VAT collection start to April 21st.

docs/kagi/plans/family-plan.md

@@ -1,6 +1,6 @@
 # Family Plan
 
-> **Important Notice:** Effective April 11th, 2024, Kagi will begin collecting applicable sales tax/VAT on all new subscription purchases to comply with global tax regulations. For existing members, sales tax/VAT will be applied to your next renewal after April 18th, 2024. Please visit the [FAQ](../faq/sales-tax-vat.md) for more information.
+> **Important Notice:** Effective April 11th, 2024, Kagi will begin collecting applicable sales tax/VAT on all new subscription purchases to comply with global tax regulations. For existing members, sales tax/VAT will be applied to your next renewal after April 21st, 2024. Please visit the [FAQ](../faq/sales-tax-vat.md) for more information.
 
 Since the inception, Kagi has been driven by the idea of humanizing the web, especially for families and kids. Our commitment to this cause was the inspiration behind the creation of Kagi. Many of our staff are parents are are working together to build a better search and web future for our children. We strive to provide a search engine that prioritizes the well-being of your loved ones, particularly the most vulnerable ones like children, by offering an ad-free and safe browsing experience. We offer two different group plans based on your specific needs.