Fix NUTS docstring formatting to match HMC and HMCDA style

[ArpanC6]

What does this PR do?

This PR addresses the inconsistency in the docstring formatting for NUTS compared to HMC and HMCDA in the same file.

Changes made

Added header comments (e.g., # Usage, # Arguments) to the corresponding sections for better structure.
Fixed formatting by removing extra spaces before colons in argument lists (e.g., changed n_adapts::Int : to n_adapts::Int:).
Corrected a missing closing parenthesis in the method signature in the docstring header.
Ensured the style aligns with the formatting used in the HMC and HMCDA docstrings making everything consistent.

Why?

Consistent docstring formatting improves the readability of the API documentation and aligns it with Julia’s documentation standards used throughout the file.

[ArpanC6]

@yebai @penelopeysm This is my first contribution to Turing.jl.
Please let me know if any changes are needed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.23%. Comparing base (89b1ce0) to head (56e93a9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2818   +/-   ##
=======================================
  Coverage   85.23%   85.23%           
=======================================
  Files          22       22           
  Lines        1483     1483           
=======================================
  Hits         1264     1264           
  Misses        219      219           

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[penelopeysm]

Thanks!

[ArpanC6]

Thanks!

Welcome