updated old docs-beta links

Signed-off-by: Kyle Davis <[email protected]>

Author: stockholmux

lib/logstash/outputs/opensearch/http_client.rb

@@ -403,7 +403,7 @@ def template_put(name, template)
 
     def template_endpoint
       # TODO: Check Version < 7.8 and use index template for >= 7.8 & OpenSearch
-      # https://docs-beta.opensearch.org/opensearch/index-templates/
+      # https://opensearch.org/docs/opensearch/index-templates/
       '_template'
     end