update sidebar ordering

Author: polyzos

website/docs/maintenance/operations/alter-config.md

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-title: Alter Configuration
-sidebar_position: 4
+title: Alter Configurations
+sidebar_position: 1
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-# Alter Configuration
+# Alter Configurations
 ## Overview
 
 Fluss provides ways to alter the configuration of a cluster or a table. You can change and apply the configuration without restarting Fluss server. In this section, we will show how to alter the configuration of a cluster or a table.

website/docs/maintenance/operations/upgrade-notes-0.9.md

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 title: Upgrade Notes
-sidebar_position: 3
+sidebar_position: 4
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 # Upgrade Notes from v0.8 to v0.9

website/docs/maintenance/operations/upgrading.md

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 title: Upgrading and Compatibility
-sidebar_position: 1
+sidebar_position: 3
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 As an online storage service, Fluss is typically designed to operate over extended periods, often spanning several years.