Update upgrade-description files.

wiki/src/upgrade/v1/Tails/4.0~beta2/amd64/alpha/upgrades.yml

+---
+build-target: amd64
+channel: alpha
+product-name: Tails
+product-version: 4.0~beta2

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wiki/src/upgrade/v1/Tails/4.0~beta2/amd64/stable/upgrades.yml

+---
+build-target: amd64
+channel: stable
+product-name: Tails
+product-version: 4.0~beta2

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