menu fix preview (#24561)

Author: ddhodge

docs/content/preview/api/ysqlsh-meta-commands.md

@@ -7,7 +7,7 @@ headcontent: Run commands without querying the database
 aliases:
   - /preview/admin/ysqlsh-meta-commands/
 menu:
-  preview:
+  preview_api:
     identifier: ysqlsh-meta-commands
     parent: ysqlsh
     weight: 10

docs/content/preview/api/ysqlsh-meta-examples.md

@@ -7,7 +7,7 @@ headcontent: Examples of ysqlsh meta-commands
 aliases:
   - /preview/admin/ysqlsh-meta-examples/
 menu:
-  preview:
+  preview_api:
     identifier: ysqlsh-meta-examples
     parent: ysqlsh-meta-commands
     weight: 20

docs/content/preview/api/ysqlsh-pset-options.md

@@ -7,7 +7,7 @@ headcontent: Options for the \pset meta-command
 aliases:
   - /preview/admin/ysqlsh-pset-options/
 menu:
-  preview:
+  preview_api:
     identifier: ysqlsh-pset-options
     parent: ysqlsh-meta-commands
     weight: 10