[DOCS-9459] Clarify where to add percentile aggregations (#33419)

Clarified how to add percentile aggregations to distribution metrics in-app.

Author: buraizu

content/en/metrics/types.md

@@ -208,7 +208,7 @@ Suppose you are submitting a DISTRIBUTION metric, `request.response_time.distrib
 
 Like other metric types, such as GAUGE or HISTOGRAM, the DISTRIBUTION metric type has the following aggregations available: `count`, `min`, `max`, `sum`, and `avg`. Distribution metrics are initially tagged the same way as other metrics (with custom tags set in the code).
 
-Additional percentile aggregations (`p50`, `p75`, `p90`, `p95`, `p99`) can be added to distribution metrics. If you were to add percentile aggregations to your distribution metric in-app, the following five additional aggregations are available for query:
+Additional percentile aggregations (`p50`, `p75`, `p90`, `p95`, `p99`) can be added to distribution metrics from the metric's [details sidepanel][2]. If you were to add percentile aggregations to your distribution metric in-app, the following five additional aggregations are available for query:
 
 | Metric Name                              | Value | Datadog In-app Type |
 | ---------------------------------------- | ----- | ------------------- |
@@ -227,6 +227,7 @@ This functionality allows you to control tagging for metrics where host-level gr
 **Note**: The exclusion of tags is not supported in the allowlist-based customization of tags. Adding tags starting with `!` is not accepted.
 
 [1]: /metrics/metrics-without-limits/
+[2]: /metrics/summary/#metric-details-sidepanel
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