[apm] Update Applications nav subsection from "Services" to "Service inventory" (#4517)

* update references to services item in serverless side bar

* update references to services item in stateful side bar

* scale back serverless updates

Author: colleenmcginnis

docs/en/observability/apm/view-and-analyze/ui-overview/services.asciidoc

@@ -36,7 +36,7 @@ and enable the **Service groups feature**.
 
 To create a service group:
 
-. Navigate to **Observability** → **Applications** → **Services**.
+. Navigate to **Observability** → **Applications** → **Service inventory**.
 . Switch to **Service groups**.
 . Click **Create group**.
 . Specify a name, color, and description.

docs/en/observability/monitor-k8s/monitor-k8s-application-performance.asciidoc

@@ -210,7 +210,7 @@ kubectl apply -f demo.yml
 [discrete]
 === View your traces in {kib}
 
-To view your application's trace data, open {kib} and go to *{observability} → Services*.
+To view your application's trace data, open {kib} and go to *{observability} → Service inventory*.
 
 The Applications UI allows you to monitor your software services and applications in real-time:
 visualize detailed performance information on your services, identify and analyze errors,

docs/en/serverless/apm/apm-find-transaction-latency-and-failure-correlations.asciidoc

@@ -16,7 +16,7 @@ address or region, is facing increased latency due to local data center issues.
 
 To find correlations:
 
-. In your {obs-serverless} project, go to **Applications** → **Services**.
+. In your {obs-serverless} project, go to **Applications** → **Service Inventory**.
 . Select a service.
 . Select the **Transactions** tab.
 . Select a transaction group in the **Transactions** table.

docs/en/serverless/apm/apm-get-started.asciidoc

@@ -164,7 +164,7 @@ refer to <<observability-apm-send-data-to-elastic>>.
 After one or more APM agents are installed and successfully sending data, you can view
 application performance monitoring data in the UI.
 
-In the _Applications_ section of the main menu, select **Services**.
+In the _Applications_ section of the main menu, select **Service Inventory**.
 This will show a high-level overview of the health and general performance of all your services.
 
 Learn more about visualizing APM data in <<observability-apm-view-and-analyze-traces>>.

docs/en/serverless/apm/apm-ui-services.asciidoc

@@ -45,7 +45,7 @@ image::images/services/apm-service-group.png[Example view of service group in th
 
 To create a service group:
 
-. In your {obs-serverless} project, go to **Applications** → **Services**.
+. In your {obs-serverless} project, go to **Applications** → **Service Inventory**.
 . Switch to **Service groups**.
 . Click **Create group**.
 . Specify a name, color, and description.