Fix typo - it says there were 3 packages but 4 were listed (#77)

Author: BellringerQuinn

sdk/web/overview.mdx

@@ -7,7 +7,7 @@ sidebarTitle: Overview
 
 We provide your users with a smooth and secure onboarding experience. With our robust tools built on the popular [wagmi](https://wagmi.sh/) library, unlock a realm of possibilities in the world of web3.
 
-Web SDK is made up of 3 main packages:
+Web SDK is made up of 4 main packages:
 
 - @0xsequence/connect
 - @0xsequence/checkout