docs: add Datadog Users example to examples.md

[devin-ai-integration]

Add Datadog Users example to documentation

This PR adds a new Users example to the Datadog integration documentation, including:

• User blueprint configuration with properties for email, handle, status, and other user-related fields
• Integration configuration for syncing Datadog user data to Port

Testing

The changes have been formatted using Prettier.

Link to Devin run: https://app.devin.ai/sessions/c8dceecffee84671ba41ab4f1740b1c4

[devin-ai-integration]

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[Matanga1-2]

Go over all the code you added so far and replace all the "mailto" syntax to [email protected]