Fixed draft related docstrings

[piotrkluba]

Reformatted docstrings to remove warnings in sphinx

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Note

Cleans up documentation strings and examples to improve Sphinx rendering and readability.

• Normalizes bullets, paragraphs, and example blocks in create_draft, DraftContext.body_groups, and preview_selector
• Clarifies and rewraps MirrorManager docs (bullets, notes) without altering behavior
• Standardizes format_headers docs for BET results (BETForcesResultCSVModel, BETDiskCoefficientsCSVModel, radial distribution)
• Removes stray markers and fixes spacing in multiple docstrings; no code functionality modified

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