add release notes for 7.5.3#18334

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ti-chi-bot[bot] merged 19 commits into

pingcap:masterfrom

Aug 5, 2024

Commits on Jul 23, 2024

Commits on Jul 25, 2024

remove empty notes and add comments
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committed

Commits on Jul 26, 2024

update TiKV, TiFlash, BR, and TiCDC parts
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committed

Commits on Jul 30, 2024

Commits on Jul 31, 2024

Commits on Aug 1, 2024

Apply suggestions from code review

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JaySon-Huang
authored

Commits on Aug 2, 2024

update release date from 20240731 to 20240805
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