releases: add release note for v7.6.0#15667

Merged

ti-chi-bot[bot] merged 206 commits intopingcap:masterfrom qiancai:v7.6.0/release-notes

Jan 25, 2024

+555-3

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Update release-7.6.0.md
joey-yez
committed

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Update releases/release-7.6.0.md

BornChanger
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qiancai
authored

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Apply suggestions from code review
hfxsd
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Commits on Dec 29, 2023

update new features
Oreoxmt
committed

Commits on Jan 1, 2024

Update releases/release-7.6.0.md
qiancai
authored

Commits on Jan 2, 2024

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Update releases/release-7.6.0.md
qiancai
authored
update new features

Oreoxmt
and
qiancai
authored
update highlights

Oreoxmt
and
songrijie
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Commits on Jan 12, 2024

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