rename kind="doh" to kind="doh_legacy"
The purpose of this change is to make it harder to accidentally use the legacy DoH implementation and free up the "doh" kind which may be used as an alias to a modern implementation in the future.
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The purpose of this change is to make it harder to accidentally use the legacy DoH implementation and free up the "doh" kind which may be used as an alias to a modern implementation in the future.