Merge branch '2.6' of github.com:taosdata/TDengine into 2.6

docs-en/07-develop/04-query-data/index.mdx

 ---
-Sidebar_label: Select
-title: Select
+Sidebar_label: Query data
+title: Query data
 description: "This chapter introduces major query functionalities and how to perform sync and async query using connectors."
 ---
 

docs-en/07-develop/06-subscribe.mdx

 ---
-sidebar_label: Subscription
+sidebar_label: Data Subscription
 description: "Lightweight service for data subscription and publishing. Time series data inserted into TDengine continuously can be pushed automatically to subscribing clients."
 title: Data Subscription
 ---