atlasaction: remove `<br/>` in markdown #1319

Job	Run time
golangci-lint	8s
migrate-down	17s
migrate-test	21s
monitoring	39s
schema-apply (lint-review)	15s
schema-plan	8s
schema-apply (on-the-fly, true)	9s
schema-plan-approve	0s
schema-apply (remote-repo, atlas://atlas-action/plans/20240910183610, atlas://atlas-action?tag=e2e)	15s
schema-push	15s
schema-test	14s
schema-apply (local-plan, file://20240910173744.plan.hcl)	14s
schema-apply (multiple-envs, file://20240910173744.plan.hcl)	8s
shim	17s
shim-e2e	6s
schema-apply (legacy, v0.27.0, true)	16s
unit-tests	1m 15s
	4m 57s

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