OpenTelemetry docs explain what value Sentry adds

### Description

OTel docs (https://docs.sentry.io/platforms/java/opentelemetry) should explain what value Sentry adds for customers who are already using OpenTelemetry but not Sentry.

See https://github.com/getsentry/sentry-docs/pull/13202#pullrequestreview-2736664804 for suggestions on how to improve.

從 docs.sentry.io/platforms/java/opentelemetry 開始，查看 pull request 13202 中的建議。更新 OpenTelemetry 文件，說明 Sentry 對已經使用 OpenTelemetry 的客戶的價值，然後確認修訂後的頁面是否回應了這些建議，並清楚傳達相關優勢。

由索引模型根據 Issue 內容生成。