Update 2_async-profiler.md

Author: pareenaverma

content/learning-paths/servers-and-cloud-computing/java-perf-flamegraph/2_async-profiler.md

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-## Java Flame Graph Generation via async-profiler [async-profiler](https://github.com/async-profiler/async-profiler)
+## Java Flame Graph Generation using [async-profiler](https://github.com/async-profiler/async-profiler)
 - `async-profiler` is a low-overhead sampling profiler for JVM applications, capable of capturing CPU, allocation, and lock events to generate actionable performance insights.
 - A lightweight tool for Java performance analysis, `async-profiler` produces flame graphs and detailed stack traces with minimal runtime impact, suitable for production environments.