Revert documentation paths in Sampler submodule

[HumphreyYang]

This PR fixes the path for API entries of Sampler submodule.

Description

Change the .. currentmodule:: attribute to the old path prior to v.5.10.1. The order of entries is maintained as it is for minimal changes.

Documentation after changes are applied:

Related Issue

• Closes DOC: pymc.sample replaced by pymc.sampling.mcmc.sample in the documention #7070

Checklist

• Checked that the pre-commit linting/style checks pass
• Included tests that prove the fix is effective or that the new feature works
• Added necessary documentation (docstrings and/or example notebooks)
• If you are a pro: each commit corresponds to a relevant logical change

Type of change

• New feature / enhancement
• Bug fix
• Documentation
• Maintenance
• Other (please specify):

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📚 Documentation preview 📚: https://pymc--7072.org.readthedocs.build/en/7072/

[welcome]

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[OriolAbril]

Thanks!