pingcap / pingcap/tidb

improve the warning message for the unused hint

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#37,934 0 comments 0 reactions 1 assignee Claimed by @Reminiscent View on GitHub
sig/planner type/enhancement
Dominant language
Go
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Description

## Enhancement
Now, the hint may not take affect for some reasons. But sometimes the warning message isn't very clear to know why the hint can not take affect. So we should improve it.

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