Add elasticapmintake receiver docs (#399)

* Add elasticapmintake receiver docs

* Headings and warning

* Update elasticapmintakereceiver.md

* Update docs/reference/edot-collector/components/elasticapmintakereceiver.md

Co-authored-by: Aleksandra Spilkowska <[email protected]>

---------

Co-authored-by: Aleksandra Spilkowska <[email protected]>

Author: theletterf

docs/docset.yml

@@ -16,6 +16,7 @@ cross_links:
   - cloud
   - cloud-on-k8s
   - docs-content
+  - ecs
   - elastic-otel-dotnet
   - elastic-otel-java
   - elastic-otel-node