[NDM] Add netflow troubleshooting packet drops section

[TCheruy]

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]

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

[aliciascott]

Hi @TCheruy thanks for adding this! I have a few suggestions (we want to keep NetFlow as camel case to align with how it is in the app and the rest of the document), a few other minor things , also can you indent the steps (# 1, # 2, etc), 2 spaces to the right and the code samples need indented 4 spaces to the right for formatting so they align? Here is an example of how that would look:

https://docs.datadoghq.com/network_monitoring/devices/guide/device_profiles/#add-tabular-tags

Also you need to click the button to merge master into this branch as there is now a merge conflict (which was introduced by me in another PR, sorry about that!)

[aliciascott]

Hi @TCheruy thanks for the updates, looks good! did you want to adjust that one sentence per @FlorianVeaux comment to state it's specific to Linux only? I am fine with it either way, let me know and then I can get this merged for you!

[TCheruy]

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

[aliciascott]

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 🙇‍♂️