man: reindent and rebreak systemd.network

Also fixes the following:
- IPServiceType= is moved to [DHCPv4] section,
- drop an incorrect sentence in RouteMTUBytes= in [DHCPv4] section.
- drop unnecessary word 'unsigned'.
This commit is contained in:
Yu Watanabe 2021-12-23 16:49:42 +09:00 committed by Zbigniew Jędrzejewski-Szmek
parent 8f7a0fcbec
commit add469f5a9

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