add ingest-docs team as CODEOWNERS for release notes and docset.yml (#9865)

(cherry picked from commit c8f5f63)

Author: colleenmcginnis

.github/CODEOWNERS

@@ -13,6 +13,8 @@
 /deploy/helm/edot-collector @elastic/ingest-otel-data
 /deploy/kubernetes @elastic/elastic-agent-control-plane
 /dev-tools/kubernetes @elastic/elastic-agent-control-plane
+/docs/release-notes @elastic/ingest-docs
+/docs/docset.yml @elastic/ingest-docs
 /internal/pkg/composable/providers/kubernetes @elastic/elastic-agent-control-plane
 /internal/pkg/otel/samples/darwin/autoops_es.yml @elastic/opex
 /internal/pkg/otel/samples/linux/autoops_es.yml @elastic/opex