[docs] Remove experimental message from saved objects import and expo…

…rt apis for 8.15 (#202536)

## Summary

Same as #202173 but for 8.15


### Checklist

Check the PR satisfies following conditions. 

- [x]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials

oas_docs/output/kibana.yaml

@@ -8490,12 +8490,6 @@ paths:
 
         NOTE: The `savedObjects.maxImportExportSize` configuration setting
         limits the number of saved objects which may be exported.
-
-
-        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.
       operationId: exportSavedObjectsDefault
       parameters:
         - $ref: '#/components/parameters/Saved_objects_kbn_xsrf'
@@ -8694,12 +8688,6 @@ paths:
         on the same major, or the next major. Exported saved objects are not
         backwards compatible and cannot be imported into an older version of
         Kibana.
-
-
-        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.
       operationId: importSavedObjectsDefault
       parameters:
         - $ref: '#/components/parameters/Saved_objects_kbn_xsrf'
@@ -8818,21 +8806,12 @@ paths:
               --form [email protected]
   /api/saved_objects/_resolve_import_errors:
     post:
-      description: >
+      description: |
         To resolve errors from the Import objects API, you can:
 
-
         * Retry certain saved objects
-
         * Overwrite specific saved objects
-
         * Change references to different saved objects
-
-
-        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.
       operationId: resolveImportErrors
       parameters:
         - $ref: '#/components/parameters/Saved_objects_kbn_xsrf'