IAST troubleshooting re-writes

[cbehera-newrelic]

• created a new section for IAST troubleshooting and converted the QnA format to NR standard.
• Ticket: NR-265117

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[!NOTE]

Our Vale automated writing feedback tool has suggestions for this PR. You can view these suggestions in the Files changed tab. If you're not a New Relic docs writer, we'll review any comments and you don't need to take any action (though feel free to make edits if you like!).