[NDM] Add netflow troubleshooting packet drops section

[TCheruy]

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What does this PR do? What is the motivation?

Add a section to Netflow docs on troubleshooting UDP packet drops Preview here NDMII-2844

Merge instructions

• [ ] Please merge after reviewing

Additional notes

[github-actions[bot]]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/ThibaudC/netflow-troubleshoot-packet-drops/network_monitoring/devices/netflow

[hestonhoffman]

Opened DOCS-8368 for someone on the docs team to take a look

[TCheruy]

Thanks a lot @aliciascott ! just pushed 8bd8371 to specify that it's linux only, let me know what you think 🙇‍♂️

[git-thuerk-done]

Thanks a lot @aliciascott ! just pushed 8bd8371 to specify that it's linux only, let me know what you think 🙇‍♂️

Looks good! @TCheruy let me know if this is ok to go ahead and merge ?

[TCheruy]

@aliciascott Let's wait for a final review from Florian when he's back on Friday, will let you know when we're good 🙇‍♂️