update TiDB Self-Managed release notes links (#3089) #8258

Job	Run time
verify-internal-links	1m 28s
check-control-characters	9s
check-manual-line-breaks	11s
check-unclosed-tags	13s
markdownlint	26s
check-file-encoding	10s
verify-internal-link-anchors	19s
check-git-conflicts	9s
	3m 5s

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