[Docathon][Fix note No.11-13]

[Keywennn]

内容：
调整rst note标签缩进

修改：
docks/api/paddle/nn/InstanceNorm1D_cn.rst
docks/api/paddle/nn/InstanceNorm2D_cn.rst
docks/api/paddle/nn/InstanceNorm3D_cn.rst

Issue: #7134
@Echo-Nie @sunzhongkai588

[paddle-bot]

感谢你贡献飞桨文档，文档预览构建中，Docs-New 跑完后即可预览，预览链接：http://preview-pr-7140.paddle-docs-preview.paddlepaddle.org.cn/documentation/docs/zh/api/index_cn.html
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[Echo-Nie]

pls sign the CLA

[luotao1]

close due to the following PR is merged:

• [Docathon][Fix note No.11-13] #7213