docs(release): fix KubeVirt SEV feature gate spelling

Address review feedback from gemini-code-assist on
docs/changelogs/v1.4.0.md:102 and coderabbitai on :103: the AMD
SEV-SNP feature gate in upstream KubeVirt source is WorkloadEncryptionSEV
(see pkg/virt-config/featuregate/active.go), not WorkloadEncruptionSEV
as quoted from the v1.7.0 release notes.

Signed-off-by: Myasnikov Daniil <myasnikovdaniil2001@gmail.com>

docs/changelogs/v1.4.0.md

@@ -99,7 +99,7 @@ Most operators can take v1.4.0 with no manual action — Cozystack stays on the
 
 * **KubeVirt**: v1.6.3 → v1.8.2. Two-minor jump crossing the upstream QEMU bump — VMs running before the upgrade need a cold restart (see Upgrade Notes). New CRD fields for changed block tracking (storage-agnostic incremental backups), `s390x` support added, `ppc64le` deprecated. The standalone ServiceMonitor / alerts templates are removed in favour of the Helm-rendered PrometheusRule. ([v1.7.0 notes](https://github.com/kubevirt/kubevirt/releases/tag/v1.7.0), [v1.8.0 notes](https://github.com/kubevirt/kubevirt/releases/tag/v1.8.0)) ([**@IvanHunters**](https://github.com/IvanHunters) in #2502)
   - **VM Backup API + Changed Block Tracking** — new alpha `VMBackup` resource and `ChangedBlockTracking` matcher on `KubeVirt` enable storage-agnostic incremental backups; CBT also applies to hotplug volumes; libvirt checkpoints survive VM restart for resumable incremental flows.
-  - **Confidential VMs (experimental)**: Intel TDX support behind the `WorkloadEncryptionTDX` feature gate, AMD SEV-SNP behind `WorkloadEncruptionSEV` (alongside the existing SEV/SEV-ES paths).
+  - **Confidential VMs (experimental)**: Intel TDX support behind the `WorkloadEncryptionTDX` feature gate, AMD SEV-SNP behind `WorkloadEncryptionSEV` (alongside the existing SEV/SEV-ES paths).
   - **VMPool gains a real lifecycle**: new `pool.kubevirt.io/v1beta1` API with auto-healing, Proactive/Opportunistic scale-in, statePreservation, UpdateStrategy with Selection policies, and proper finalizer cleanup.
   - **Live-migration improvements**: dedicated mTLS certificate, migration allowed when host CPU model changes after a libvirt upgrade, decentralized live migration on L3 networks and across volumes with different volumeModes, live-migration for ImageVolume with modified container disk images.
   - **Eviction / evacuation control**: new `/evacuate/cancel` subresource and `virtctl evacuate-cancel` command to abort an in-flight evacuation cycle; new `VirtualMachineInstanceEvictionRequested` condition for tracking.