[DOCS] Add API docs feedback link (#2805)

Author: lcawl

.gitignore

@@ -64,3 +64,7 @@ output/schema/schema
 
 # Test suite outputs
 compiler/test/**/output/
+
+# Temporary openAPI files
+output/openapi/elasticsearch-serverless-openapi.tmp.json
+output/openapi/elasticsearch-serverless-openapi.examples.json

docs/overlays/elasticsearch-serverless-openapi-overlays.yaml

@@ -5,12 +5,15 @@ info:
   version: 0.0.1
 actions:
   - target: '$.info'
-    description: Add a document description
+    description: Add a document description and feedback link
     update:
       description: >
         **Technical preview**  
         This functionality is in technical preview and may be changed or removed in a future release.
         Elastic will work to fix any issues, but features in technical preview are not subject to the support SLA of official GA features.
+      x-feedbackLink:
+        label: Feedback
+        url: https://github.com/elastic/docs-content/issues/new?assignees=&labels=feedback%2Ccommunity&projects=&template=api-feedback.yaml&title=%5BFeedback%5D%3A+
   - target: "$.components['requestBodies']['async_search.submit']"
     description: "Add example for asynch search submit request"
     update: