toc: add global indexes to cloud plans (#22147)

Author: lilin90

TOC-tidb-cloud-essential.md

@@ -486,6 +486,7 @@
     - [List of Expressions for Pushdown](/functions-and-operators/expressions-pushed-down.md)
     - [TiDB Specific Functions](/functions-and-operators/tidb-functions.md)
   - [Clustered Indexes](/clustered-indexes.md)
+  - [Global Indexes](/global-indexes.md)
   - [Constraints](/constraints.md)
   - [Generated Columns](/generated-columns.md)
   - [SQL Mode](/sql-mode.md)

TOC-tidb-cloud-premium.md

@@ -459,6 +459,7 @@
     - [List of Expressions for Pushdown](/functions-and-operators/expressions-pushed-down.md)
     - [TiDB Specific Functions](/functions-and-operators/tidb-functions.md)
   - [Clustered Indexes](/clustered-indexes.md)
+  - [Global Indexes](/global-indexes.md)
   - [Constraints](/constraints.md)
   - [Generated Columns](/generated-columns.md)
   - [SQL Mode](/sql-mode.md)

TOC-tidb-cloud-starter.md

@@ -519,6 +519,7 @@
     - [List of Expressions for Pushdown](/functions-and-operators/expressions-pushed-down.md)
     - [TiDB Specific Functions](/functions-and-operators/tidb-functions.md)
   - [Clustered Indexes](/clustered-indexes.md)
+  - [Global Indexes](/global-indexes.md)
   - [Constraints](/constraints.md)
   - [Generated Columns](/generated-columns.md)
   - [SQL Mode](/sql-mode.md)