Docs: add managed_hsm_key_id property to azurerm_mssql_server_transparent_data_encryption docs

[catriona-m]

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Description

managed_hsm_key_id was mistakenly added to azurerm_mssql_managed_instance_transparent_data_encryption instead of azurerm_mssql_server_transparent_data_encryption

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have checked if my changes close any open issues. If so please include appropriate closing keywords below.
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  For example: “resource_name_here - description of change e.g. adding property new_property_name_here”

[katbyte]

LGTM 🤖

[github-actions]

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