Update TESTING.md

Signed-off-by: Atharva Sharma <60044988+atharvasharma61@users.noreply.github.com>

TESTING.md

@@ -84,7 +84,7 @@ This will instruct all JVMs (including any that run cli tools such as creating t
 -   In order to remotely attach a debugger to the process: `--debug-jvm`
 -   In order to set a different keystore password: `--keystore-password yourpassword`
 -   In order to set an OpenSearch setting, provide a setting with the following prefix: `-Dtests.opensearch.`
--   In order to enable stack trace of the MockSpanData during testing, add: `-Dtests.telemetry.span.stack_traces=true` (Note: Enabling this might lead to OOM issues while running ITs)
+-   In order to enable stack trace of the MockSpanData during testing, add: `-Dtests.telemetry.span.stack_traces=true` (Storing stack traces alongside span data can be useful for comprehensive debugging and performance optimization during testing, as it provides insights into the exact code paths and execution sequences, facilitating efficient issue identification and resolution. Note: Enabling this might lead to OOM issues while running ITs)
 
 ## Test case filtering