[Docs] Fix RST formatting issues in diagonal, diff, and diagflat API docs#7792

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Echo-Nie merged 2 commits intoPaddlePaddle:developfrom

StatefulDust:fix/api-docs-compliance-diagonal-diff-diagflat-b89bc90f0a8a3508

Feb 28, 2026

Commits on Feb 28, 2026

Fix RST formatting issues in diagonal, diff, and diagflat API docs

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Fix return value format in diagonal_cn.rst per API docs guidelines
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