Fix version typo in using-auto-tls.md

[MIBc]

Fixes #knative/serving#6980

[knative-prow-robot]

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[mattmoor]

This should use the artifact shortcode

Suggested change

	kubectl apply --filename https://github.com/knative/serving/releases/download/{{< version >}}/serving-cert-manager.yaml
	kubectl apply --filename {{< artifact repo="serving" file="serving-cert-manager.yaml" >}}

[MIBc]

done

[mattmoor]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mattmoor, MIBc

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[knative-prow-robot]

@MIBc: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-knative-docs-markdown-link-check	87c06f7	link	/test pull-knative-docs-markdown-link-check

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