Update docs/en/sql-reference/aggregate-functions/reference/sparkbar.md

Co-authored-by: olgarev <56617294+olgarev@users.noreply.github.com>
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# sparkbar {#sparkbar}
The function plots a frequency histogram for values `x` and the repetition rate of these `y` values over the interval `[min_x, max_x]`.
The function plots a frequency histogram for values `x` and the repetition rate `y` of these values over the interval `[min_x, max_x]`.
If no interval is specified, then the minimum `x` is used as the interval start, and the maximum `x` — as the interval end.