[8.16](backport #4589) Port PR 4488 to Serverless - adding k8s-otel q…

…uickstart guide (#4606)

* Port PR 4488 to Serverless - adding k8s-otel quickstart guide (#4589)

* k8s-otel quickstart added to serverless
* minor fixes in stateful

(cherry picked from commit 58c98f8)

# Conflicts:
#	docs/en/serverless/index.asciidoc
#	docs/en/serverless/observability-get-started.asciidoc

* Delete docs/en/serverless directory

---------

Co-authored-by: Edu González de la Herrán <25320357+eedugon@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

docs/en/observability/observability-get-started.asciidoc

@@ -54,7 +54,8 @@ Follow the steps in these guides to get started quickly:
 
 * <<quickstart-monitor-hosts-with-elastic-agent>>
 * <<monitor-k8s-logs-metrics-with-elastic-agent>>
-
+* <<monitor-k8s-otel-edot>>
+* <<collect-data-with-aws-firehose>>
 
 [discrete]
 === Get started with other features

docs/en/observability/quickstarts/monitor-k8s-otel.asciidoc

@@ -60,7 +60,7 @@ image::images/quickstart-k8s-otel-dashboard.png[Kubernetes overview dashboard]
 [discrete]
 == Troubleshooting and more
 
-* For troubleshooting deployment and installation, refer to https://github.com/elastic/opentelemetry/tree/main/docs/kubernetes/operator#installation-verification[installation verification].
+* To troubleshoot deployment and installation, refer to https://github.com/elastic/opentelemetry/tree/main/docs/kubernetes/operator#installation-verification[installation verification].
 * For application instrumentation details, refer to https://github.com/elastic/opentelemetry/blob/main/docs/kubernetes/operator/instrumenting-applications.md[Instrumenting applications with EDOT SDKs on Kubernetes].
-* For customizing the configuration, refer to https://github.com/elastic/opentelemetry/tree/main/docs/kubernetes/operator#custom-configuration[custom configuration].
+* To customize the configuration, refer to https://github.com/elastic/opentelemetry/tree/main/docs/kubernetes/operator#custom-configuration[custom configuration].
 * Refer to <<observability-introduction>> for a description of other useful features.