Update networking.md

[Horsevad]

Updated that the hostname takes a lowercase -i as the address flag. This can be seen by running hostname --help.

Also made the "under the hood" section more verbose with the full length --ip-addresses command, which might be easier to remember / understand for new users.

[learn-build-service-prod[bot]]

Learn Build status updates of commit 54692e3:

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[Horsevad]

Is there any way to get someone assigned to this

[mattwojo]

Great update - thank you! (And sorry for the delay -- was busy preparing for Ignite conference)