Update nerdgraph-streaming-export.mdx

[natharrow]

Update the steps of configuring Azure Event Hubs to communicate what retention policy is supported by Streaming Export.

Give us some context

• What problems does this PR solve?
  • Informs users how to configure their Event Hub to ensure a working streaming export Azure rule
  • Clarifies what retention policy is not currently supported in streaming export
• Add any context that will help us review your changes such as testing notes, links to related docs, screenshots, etc.
  • Screenshots of the UI described it the edited section.
    • Supported configuration:
    • Invalid configuration:

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