Update doc links to Fleet/Agent docs (#115289)

docs/getting-started/quick-start-guide.asciidoc

@@ -138,7 +138,7 @@ image::images/dashboard_sampleDataAddFilter_7.15.0.png[The [eCommerce] Revenue D
 [[quick-start-whats-next]]
 == What's next?
 
-*Add your own data.* Ready to add your own data? Go to {fleet-guide}/fleet-quick-start.html[Quick start: Get logs and metrics into the Elastic Stack] to learn how to ingest your data, or go to <<connect-to-elasticsearch,Add data to {kib}>> and learn about all the other ways you can add data.
+*Add your own data.* Ready to add your own data? Go to {observability-guide}/ingest-logs-metrics-uptime.html[Ingest logs, metrics, and uptime data with {agent}], or go to <<connect-to-elasticsearch,Add data to {kib}>> and learn about all the other ways you can add data.
 
 *Explore your own data in Discover.* Ready to learn more about exploring your data in *Discover*? Go to <<discover, Discover>>.
 

docs/osquery/osquery.asciidoc

@@ -365,7 +365,7 @@ The following is an example of an **error response** for an undefined action que
 == System requirements
 
 * {fleet-guide}/fleet-overview.html[Fleet] is enabled on your cluster, and
-one or more {fleet-guide}/elastic-agent-installation-configuration.html[Elastic Agents] is enrolled.
+one or more {fleet-guide}/elastic-agent-installation.html[Elastic Agents] is enrolled.
 * The https://docs.elastic.co/en/integrations/osquery_manager[*Osquery Manager*] integration
 has been added and configured
 for an agent policy through Fleet.

docs/setup/connect-to-elasticsearch.asciidoc

@@ -47,7 +47,7 @@ so you can quickly get insights into your data, and {fleet} mode offers several
 image::images/addData_fleet_7.15.0.png[Add data using Fleet]
 
 To get started, refer to
-{fleet-guide}/fleet-quick-start.html[Quick start: Get logs and metrics into the Elastic Stack].
+{observability-guide}/ingest-logs-metrics-uptime.html[Ingest logs, metrics, and uptime data with {agent}].
 
 [discrete]
 [[upload-data-kibana]]