update TiDB Self-Managed release notes links (#3089) #8259

Job	Run time
verify-internal-links	1m 41s
check-control-characters	11s
check-file-encoding	11s
check-unclosed-tags	9s
markdownlint	48s
verify-internal-link-anchors	19s
check-git-conflicts	11s
check-manual-line-breaks	9s
	3m 39s

Provide feedback