fix legacy java link

docs/platforms/java/common/legacy/logback/index.mdx

@@ -9,7 +9,7 @@ A new Java SDK has superseded this deprecated version. Sentry preserves this doc
 
 </Alert>
 
-The `sentry-logback` library provides [Logback](http://logback.qos.ch/) support for Sentry via an [Appender](http://logback.qos.ch/apidocs/ch/qos/logback/core/Appender.html) that sends logged exceptions to Sentry. Once this integration is configured you can _also_ use Sentry’s static API, [as shown on the usage page](/platforms/java/legacy/usage), in order to do things like record breadcrumbs, set the current user, or manually send events.
+The `sentry-logback` library provides [Logback](http://logback.qos.ch/) support for Sentry via an [Appender](https://logback.qos.ch/manual/appenders.html) that sends logged exceptions to Sentry. Once this integration is configured you can _also_ use Sentry’s static API, [as shown on the usage page](/platforms/java/legacy/usage), in order to do things like record breadcrumbs, set the current user, or manually send events.
 
 The source can be found [on GitHub](https://github.com/getsentry/sentry-java/tree/master/sentry-logback).