releases: add tidb 4.0.15 release notes (#7129)#7191

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ti-chi-bot merged 12 commits intopingcap:release-5.0from ti-chi-bot:cherry-pick-7129-to-release-5.0

Sep 27, 2021

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Commits on Sep 27, 2021

releases: add tidb 4.0.15 release notes

TomShawn
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ti-chi-bot
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Update release-4.0.15.md

IANTHEREAL
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add notes according to comments

TomShawn
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ti-chi-bot
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revise < 44

TomShawn
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revise < 97

TomShawn
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revise > end

TomShawn
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ti-chi-bot
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Update release-4.0.15.md

qiancai
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more pr to issue

TomShawn
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ti-chi-bot
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Update releases/release-4.0.15.md

TomShawn
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ti-chi-bot
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fix

TomShawn
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ti-chi-bot
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Update releases/release-4.0.15.md

TomShawn
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ti-chi-bot
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add compatibility changes

TomShawn
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