reference: update views and constraints (#3199) #3313
Merged
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cherry-pick #3199 to release-3.0
What is changed, added or deleted? (Required)
Which TiDB version(s) do your changes apply to? (Required)
For views.md:
For constraints.md:
So when this PR is cherry-picked to 3.1/3.0 branches, the changes to constraints.md should be deleted. Please be aware. @ran-huang
What is the related PR or file link(s)?