docs: update default value (#2025)

Author: ZhongpinWang

docs-js/features/connectivity/destination.mdx

@@ -490,7 +490,7 @@ A few of the options were already listed above, but this section gives a compreh
   Default is `subscriberFirst`.
   Alternative values are `alwaysProvider` and `alwaysSubscriber`.
 - `iasToXsuaaTokenExchange`: Switches on token exchange from IAS format tokens to XSUAA if needed using the `@sap/xssec` library.
-  The default value is `true`.
+  The default value is `false`.
 - `cacheVerificationKeys`: Switches on caching for the verification certificates for the JWT.
   The default value is `true`.
 - `useCache`: Switches on caching for destinations received from the destination service.