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docs: mention tlast_over_time in influx guide

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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/8188

Signed-off-by: hagen1778 <roman@victoriametrics.com>
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11
docs/guides/migrate-from-influx/README.md
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@ -258,12 +258,13 @@ consider [backfilling tips](https://docs.victoriametrics.com/single-server-victo
* _VictoriaMetrics may return non-existing data points if `step` param is lower than the actual data resolution. See
more about this [here](https://docs.victoriametrics.com/keyconcepts/#range-query)._
* How do I get the `real` last data point, not `ephemeral`?
* _[last_over_time](https://docs.victoriametrics.com/metricsql/#last_over_time) function can be used for
limiting the lookbehind window for calculated data. For example, `last_over_time(metric[10s])` would return
calculated samples only if the real samples are located closer than 10 seconds to the calculated timestamps
according to
`start`, `end` and `step` query args passed
* _[last_over_time](https://docs.victoriametrics.com/metricsql/#last_over_time) function returns last value on
the given look-behind window. For example, `last_over_time(metric[10s])` would return
sample values only if the real samples are located closer than 10 seconds to the calculated timestamps
according to `start`, `end` and `step` query args passed
to [range query](https://docs.victoriametrics.com/keyconcepts/#range-query)._
* _[tlast_over_time](https://docs.victoriametrics.com/metricsql/#tlast_over_time) function returns last timestamp on
the given look-behind window, similarly to [last_over_time](https://docs.victoriametrics.com/metricsql/#last_over_time)._
* How do I get raw data points with MetricsQL?
* _For getting raw data points specify the interval at which you want them in square brackets and send
as [instant query](https://docs.victoriametrics.com/keyconcepts/#instant-query). For