docs(2.14): adding basic upgrading docs for 2.14 (#21744) (#21752) #454

Job	Run time
argocd-image / publish	20m 52s
argocd-image-provenance / detect-env	2s
argocd-image-provenance / generator	16s
argocd-image-provenance / final	1s
goreleaser	19m 9s
Create SBOM and generate hash	3m 49s
goreleaser-provenance / detect-env	5s
goreleaser-provenance / generator	11s
goreleaser-provenance / upload-assets	7s
goreleaser-provenance / final	1s
post-release	20s
sbom-provenance / detect-env	2s
sbom-provenance / generator	12s
sbom-provenance / upload-assets	7s
sbom-provenance / final	1s
	45m 15s

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