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Update docs/en/sql-reference/dictionaries/external-dictionaries/external-dicts-dict-sources.md

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Co-authored-by: gyuton <40863448+gyuton@users.noreply.github.com>
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@ -541,7 +541,7 @@ Setting fields:
- `query` – The custom query. Optional parameter.
!!! info "Note"
The `table` or `where` fields cannot be used together with the `query` field. And there must be one of the sources of either `table` or `query`.
The `table` or `where` fields cannot be used together with the `query` field. And either one of the `table` or `query` fields must be declared.
MySQL can be connected on a local host via sockets. To do this, set `host` and `socket`.