[APM] UI text updates (#71333) (#71366)

Co-authored-by: Brandon Morelli <[email protected]>

Author: sorenlouv

docs/apm/api.asciidoc

@@ -398,7 +398,7 @@ include::api.asciidoc[tag=using-the-APIs]
 [%collapsible%open]
 ======
 `version` :::
-  (required, string) Name of service.
+  (required, string) Version of service.
 
 `environment` :::
   (optional, string) Environment of service.

x-pack/plugins/apm/public/components/app/Settings/anomaly_detection/index.tsx

@@ -60,7 +60,7 @@ export const AnomalyDetection = () => {
       <EuiText>
         {i18n.translate('xpack.apm.settings.anomalyDetection.descriptionText', {
           defaultMessage:
-            'The Machine Learning anomaly detection integration enables application health status indicators in the Service map by identifying transaction duration anomalies.',
+            'The Machine Learning anomaly detection integration enables application health status indicators for each configured environment in the Service map by identifying transaction duration anomalies.',
         })}
       </EuiText>
       <EuiSpacer size="l" />

x-pack/plugins/apm/public/components/app/Settings/anomaly_detection/jobs_list.tsx

@@ -91,7 +91,7 @@ export const JobsList = ({
             {i18n.translate(
               'xpack.apm.settings.anomalyDetection.jobList.addEnvironments',
               {
-                defaultMessage: 'Add environments',
+                defaultMessage: 'Create ML Job',
               }
             )}
           </EuiButton>
@@ -101,7 +101,7 @@ export const JobsList = ({
       <EuiText>
         <FormattedMessage
           id="xpack.apm.settings.anomalyDetection.jobList.mlDescriptionText"
-          defaultMessage="Manage existing anomaly detection jobs in {mlJobsLink}."
+          defaultMessage="To add anomaly detection to a new environment, create a machine learning job. Existing machine learning jobs can be managed in {mlJobsLink}."
           values={{
             mlJobsLink: (
               <MLLink path="jobs">

x-pack/plugins/observability/public/pages/overview/empty_section.ts

@@ -77,7 +77,7 @@ export const getEmptySections = ({ core }: { core: AppMountContext['core'] }): I
       icon: 'watchesApp',
       description: i18n.translate('xpack.observability.emptySection.apps.alert.description', {
         defaultMessage:
-          '503 errors stacking up. Applications not responding. CPU and RAM utilization jumping. See these warnings as they happen - not as part of the post-mortem.',
+          'Are 503 errors stacking up? Are services responding? Is CPU and RAM utilization jumping? See warnings as they happen—not as part of the post-mortem.',
       }),
       linkTitle: i18n.translate('xpack.observability.emptySection.apps.alert.link', {
         defaultMessage: 'Create alert',