Chore: Update "Observability" nav group subtitle (#78579)

Update observability nav group subtitle

public/app/core/utils/navBarItem-translations.ts

@@ -245,7 +245,7 @@ export function getNavSubTitle(navId: string | undefined) {
     case 'apps':
       return t('nav.apps.subtitle', 'App plugins that extend the Grafana experience');
     case 'monitoring':
-      return t('nav.monitoring.subtitle', 'Monitoring and infrastructure apps');
+      return t('nav.monitoring.subtitle', 'Out-of-the-box observability solutions');
     case 'alerts-and-incidents':
       return t('nav.alerts-and-incidents.subtitle', 'Alerting and incident management apps');
     case 'connections-add-new-connection':

public/app/features/connections/__mocks__/store.navIndex.mock.ts

@@ -490,7 +490,7 @@ export const navIndex: NavIndex = {
   monitoring: {
     id: 'monitoring',
     text: 'Observability',
-    subTitle: 'Monitoring and infrastructure apps',
+    subTitle: 'Out-of-the-box observability solutions',
     icon: 'heart-rate',
     url: '/monitoring',
     sortWeight: -900,