Update reference-docs-links.txt to include serverless doc reference link (#131175)

* Update reference-docs-links.txt

* Update reference-docs-links.txt

* Update ReferenceDocs.java

server/src/main/java/org/elasticsearch/common/ReferenceDocs.java

@@ -84,6 +84,7 @@ public enum ReferenceDocs {
     ALLOCATION_EXPLAIN_MAX_RETRY,
     SECURE_SETTINGS,
     CLUSTER_SHARD_LIMIT,
+    DEPLOY_CLOUD_DIFF_FROM_STATEFUL,
     // this comment keeps the ';' on the next line so every entry above has a trailing ',' which makes the diff for adding new links cleaner
     ;
 

server/src/main/resources/org/elasticsearch/common/reference-docs-links.txt

@@ -45,4 +45,5 @@ CIRCUIT_BREAKER_ERRORS                                          troubleshoot/ela
 ALLOCATION_EXPLAIN_NO_COPIES                                    troubleshoot/elasticsearch/diagnose-unassigned-shards#no-shard-copy
 ALLOCATION_EXPLAIN_MAX_RETRY                                    troubleshoot/elasticsearch/diagnose-unassigned-shards#maximum-retries-exceeded
 SECURE_SETTINGS                                                 deploy-manage/security/secure-settings
-CLUSTER_SHARD_LIMIT                                             reference/elasticsearch/configuration-reference/miscellaneous-cluster-settings#cluster-shard-limit
+CLUSTER_SHARD_LIMIT                                             reference/elasticsearch/configuration-reference/miscellaneous-cluster-settings#cluster-shard-limit
+DEPLOY_CLOUD_DIFF_FROM_STATEFUL                                 deploy-manage/deploy/elastic-cloud/differences-from-other-elasticsearch-offerings