Update release notes

Author: itsmeichigo

RELEASE-NOTES.txt

@@ -13,6 +13,7 @@
 - [*] Shipping Labels: Validate custom package dimensions [https://github.com/woocommerce/woocommerce-ios/pull/15925]
 - [*] Shipping Labels: Show UPS TOS modal in full length for better accessibility. [https://github.com/woocommerce/woocommerce-ios/pull/15926]
 - [*] Shipping Labels: Optimize data loading on purchase form [https://github.com/woocommerce/woocommerce-ios/pull/15919]
+- [*] Shipping Labels: Cache settings and origin addresses to improve loading experience for purchase form [https://github.com/woocommerce/woocommerce-ios/pull/15935]
 - [internal] Optimized assets for app size reduction [https://github.com/woocommerce/woocommerce-ios/pull/15881]
 
 22.8