🐛 [BUG] - "Upgrading to OpenTofu v1.6" section should be removed

[RLRabinowitz]

Description

Upgrading to OpenTofu v1.6 section is irrelevant. It mentions how to upgrade from version 1.0 (which does not exist) to 1.6

Reproduction steps

1. Go to https://opentofu.org/docs/main/language/upgrade-guides/
2. It mentions upgrading from 1.0 to 1.6, which is wrong

Screenshots

![DESCRIPTION](LINK.png)

Logs

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Browsers

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OS

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