Update release notes

Author: koke

RELEASE-NOTES.txt

@@ -2,6 +2,7 @@
 
 9.3
 -----
+- [***] In-Person Payments is now available for merchants using WooCommerce Payments in Canada. [https://github.com/woocommerce/woocommerce-ios/pull/6954]
 - [*] In-Person Payments: Accessibility improvement [https://github.com/woocommerce/woocommerce-ios/pull/6869, https://github.com/woocommerce/woocommerce-ios/pull/6886, https://github.com/woocommerce/woocommerce-ios/pull/6906]
 - [*] Orders: Now it's possible to select and copy text from the notes on an order. [https://github.com/woocommerce/woocommerce-ios/pull/6894]
 - [*] Support Arabic numerals on amount fields. [https://github.com/woocommerce/woocommerce-ios/pull/6891]