Update grafana-tidb-dashboard.md

[xyqcmss]

这一行在新的v5.0.0-rc的监控页面中没有，
- Wait Duration 95：等待处理的 Batch 消息延迟

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Welcome @xyqcmss!

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[xyqcmss]

/cc @TomShawn
辛苦您，看一下！

[TomShawn]

@xyqcmss "这一行在新的v5.0.0-rc的监控页面中没有" This means that the PR content is only applicable to release-5.0 and master, not to release-4.0. But this PR is based on release-4.0 and will be merged to this branch first. I am afraid that you will need to create another PR to delete this line BASED ON the MASTER branch.

[xyqcmss]

/cc @TomShawn
Okay, thank you for your guidance, I will change this version and resubmit

[TomShawn]

The new PR is #5753.
@xyqcmss Could you please close this PR? Thanks!

[xyqcmss]

/cc @TomShawn
ok，I have closed this PR！
Thanks！