traces-sampler-as-sampler is different for Java and Kotlin snippets

[marandaneto]

https://github.com/getsentry/sentry-docs/blob/master/src/includes/performance/traces-sampler-as-sampler/java.mdx

Java calls Sentry.init and also set DSN and sample rate, ideally, they'd be equivalent.

cc @maciejwalkowiak