9b76949a47
The `Domains=` option in the `[Network]` section did not document its behaviour when specified repeatedly. In practice the option is additive (each occurrence accumulates search/routing domains) and assigning an empty string resets the list, matching the closely related `DNS=` option. This is implemented by `config_parse_domains()` in `src/network/networkd-dns.c`, which frees both the search and route domain sets on an empty `rvalue` and otherwise inserts each whitespace-separated entry into the corresponding set. Document this explicitly, using the same wording already used for `DNS=` in the same man page, so users know repeated assignments are combined and that an empty value clears them. Fixes #38740.
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