[8.9] Clarify documentation for the observability:enableComparisonByDefault setting (#161372) (#161433)

# Backport

This will backport the following commits from `main` to `8.9`:
- [Clarify documentation for the
`observability:enableComparisonByDefault` setting
(#161372)](https://github.com/elastic/kibana/pull/161372)

<!--- Backport version: 8.9.7 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Co-authored-by: Felix Barnsteiner <felixbarny@users.noreply.github.com>

docs/management/advanced-options.asciidoc

@@ -408,7 +408,7 @@ preview:[] Sorts services without anomaly detection rules on the APM Service inv
 preview:[] Display Amazon Lambda metrics in the service metrics tab.
 
 [[observability-apm-enable-comparison]]`observability:enableComparisonByDefault`::
-Enables the comparison feature in the APM app.
+Determines whether the <<service-time-comparison, comparison feature>> is enabled or disabled by default in the APM app.
 
 [[observability-apm-enable-infra-view]]`observability:enableInfrastructureView`::
 Enables the Infrastructure view in the APM app.
@@ -597,4 +597,4 @@ The URL of a custom PNG image that appears on {kib} browser tabs.
 [[provide-usage-data]]`telemetry:enabled`::
 Enabling data usage collection (also known as Telemetry) allows us to learn
 what our users are most interested in, so we can improve our products and services.
-Refer to our https://www.elastic.co/legal/product-privacy-statement[Privacy Statement] for more details.
+Refer to our https://www.elastic.co/legal/product-privacy-statement[Privacy Statement] for more details.

x-pack/plugins/observability/server/ui_settings.ts

@@ -76,7 +76,8 @@ export const uiSettings: Record<string, UiSettings> = {
     }),
     value: true,
     description: i18n.translate('xpack.observability.enableComparisonByDefaultDescription', {
-      defaultMessage: 'Enable the comparison feature in APM app',
+      defaultMessage:
+        'Determines whether the comparison feature is enabled or disabled by default in the APM app.',
     }),
     schema: schema.boolean(),
   },