* Update index.mdx
Updated instructions for Vault Upgrade HA
* Create vault-ha-upgrade.mdx
Moved HA Vault upgrade instruction to a new page and added a Note for disabling automated upgrade procedure
* Add the new vault-ha-upgrade page to the side menu
* Format and wording edits
* Remove extra paracentesis
* Fix a typo
* Change the title appears on the navigation
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Co-authored-by: Yoko Hyakuna <yoko@hashicorp.com>