refine proton oss vs enterprise (#559)

Author: chenziliang

docs/proton-oss-vs-enterprise.md

@@ -6,7 +6,7 @@ Note: In the Enterprise column, a leading `+` marks capabilities that are additi
 
 |          **Categories**                     | **Timeplus Proton**                                                                                                                                                                    | **Timeplus Enterprise**                                                                                                                                                                                                          |
 | ----------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| **Deployment**                | <ul><li>Single-node Docker image</li><li>Single binary on Mac/Linux</li><li>[Kubernetes Helm Chart](/proton#kubernetes)</li></ul>                                                                                                          | <ul><li>+ [Cluster](/cluster)</li><li>[Kubernetes Helm Chart](/k8s-helm)</li></ul>                                                                               |
+| **Deployment**                | <ul><li>Single-node Docker image</li><li>Single binary on Mac/Linux</li><li>[Kubernetes Helm Chart](/proton#kubernetes)</li></ul>                                                                                                          | <ul><li>+ [Cluster](/cluster)</li></ul>                                                                               |
 | **Operation**                   |  <ul><li>[RBAC](/rbac)</li><li>[Tiered Storage](/append-stream-tiered-storage)</li><li>[Materialized View Monitoring](/materialized-view-monitoring)</li><li>[System Monitoring](/system-stream-state-log)</li></ul>                                                                                                                     | <ul><li>+ Timeplus Console for Metrics Visualization</li></ul>                                                                                                                                                      |
 | **Data Processing**                | <ul><li>[Materialized View](/materialized-view)</li><li>[Historical Data Processing](/historical-query)</li><li>[Scheduled Task](/task)</li><li>[Alert](/alert)</li><li>[JavaScript UDF](/js-udf)</li><li>[Python UDF](/py-udf)</li><li>[Remote UDF](/remote-udf)</li><li>[SQL UDF](/sql-udf)</li><li>[JIT](/jit)</li></ul>                                                                                                          | <ul><li>+ [Materialized View Scaling and High Availability](/materialized-view-high-availability)</li></ul>                                                                               |
 | **Storage Engines**                | <ul><li>[Append Stream](/append-stream)</li><li>[Versioned Key Value Stream](/versioned-stream)</li><li>[Changelog Key Value Stream](/changelog-stream)</li><li>[Dictionary](/sql-create-dictionary)</li><li>[Random Stream](/sql-create-random-stream)</li></ul>                                                                                                          | <ul><li>+ [Mutable Stream](/mutable-stream)</li></ul>                                                                               |