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Fix https://github.com/scylladb/scylladb/issues/12315 This PR adds the upgrade guide from ScyllaDB 5.1 to ScyllaDB Enterprise 2022.2. Instead of adding separate guides per platform, I've merged the information to create one platform-agnostic guide, similar to what we did for [OSS->OSS](https://docs.scylladb.com/stable/upgrade/upgrade-opensource/upgrade-guide-from-5.0-to-5.1/) and [Enterprise->Enterprise ](https://github.com/scylladb/scylladb/pull/12339)guides. Closes #12450 * github.com:scylladb/scylladb: doc: add the new upgrade guide to the toctree and fix its name docs: add the upgrade guide from ScyllaDB 5.1 to ScyllaDB Enterprise 2022.2