Docstring formatting fixes for dataclasses and functional_validators

[tpdorsey]

Minor formatting fixes for some docstrings in:

• pydantic/dataclasses.py
• pydantic/functional_validators.py

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Checklist

• Unit tests for the changes exist
• Tests pass on CI and coverage remains at 100%
• Documentation reflects the changes where applicable
• changes/<pull request or issue id>-<github username>.md file added describing change
  (see changes/README.md for details)
• My PR is ready to review, please add a comment including the phrase "please review" to assign reviewers

[hramezani]

This has conflict with @dmontagu PR on pydantic/dataclasses.py.
Better to revert your change in pydantic/dataclasses.py because the other PR is handling your change and also include more fixes.

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