system-variable: add explaination about last_plan_from_binding (#3673)#3699
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TomShawn
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Aug 20, 2020
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cherry-pick #3673 to release-4.0
What is changed, added or deleted? (Required)
add explanation about a new system variable last_plan_from_binding.
Which TiDB version(s) do your changes apply to? (Required)
What is the related PR or file link(s)?
last_plan_from_bindingdocs-cn#3702Do your changes match any of the following descriptions?