Default container documentation backport (#380)

* adding documentation for hints/processors

* adding docs for default container in 8.9

(cherry picked from commit 52bf1b9)

# Conflicts:
#	docs/en/ingest-management/elastic-agent/configuration/autodiscovery/kubernetes-hints-autodiscover.asciidoc

docs/en/ingest-management/elastic-agent/configuration/autodiscovery/kubernetes-hints-autodiscover.asciidoc

@@ -92,7 +92,7 @@ https://github.com/elastic/elastic-agent/tree/main/deploy/kubernetes/elastic-age
 [discrete]
 == Configure hints autodiscovery
 
-To enable hints, you must add `hints.enabled: true` to the provider's configuration:
+To enable hints autodiscovery, you must add `hints.enabled: true` to the provider's configuration:
 
 [source,yaml]
 ----
@@ -134,6 +134,13 @@ initContainers:
       mountPath: /etc/elastic-agent/inputs.d
 ----
 
+<<<<<<< HEAD
+=======
+
+NOTE: The {agent} can load multiple configuration files from `{path.config}/inputs.d`  and finally produce a unified one (refer to <<elastic-agent-configuration>>). Users have the ability to manually mount their own templates under `/etc/elastic-agent/inputs.d` *if they want to skip enabling initContainers section*.
+
+
+>>>>>>> 52bf1b9 (Default container documentation backport (#380))
 [discrete]
 == Example: Hints autodiscovery