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Update docs/feature_flags.md

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Signed-off-by: Bartlomiej Plotka <bwplotka@gmail.com>
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@ -111,7 +111,7 @@ Enables the use of start timestamps (ST) in PromQL functions such as `rate()`, `
`--enable-feature=st-synthesis`
Enables the synthesis of start timestamps (ST) for cumulative metrics (Counters, Classic Histograms, Native Histograms, and Summaries) when they are not provided by the source. Similar to [the official OpenTelemetry metricstarttimeprocessor](https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/processor/metricstarttimeprocessor#strategy-subtract-initial-point), it tracks previous values to detect resets and subtracts the initial reference point to synthesize a zero-based timeline from the first sample.
Enables the synthesis of start timestamps (ST) for cumulative metrics (Counters, Classic Histograms, Native Histograms) when they are not provided by the source. Similar to [the official OpenTelemetry metricstarttimeprocessor](https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/processor/metricstarttimeprocessor#strategy-subtract-initial-point), it tracks previous values to detect resets and subtracts the initial reference point to synthesize a zero-based timeline from the first sample.
> NOTE: This is an experimental feature.
> * The first sample is dropped when this feature is turned on to establish the start timestamp reference point. As a result, if a series has only a single point reported, turning this feature on may result in no points being ingested for that series.