Update documentation

[ViniciusTxc3]

This PR addresses numerous documentation gaps and errors identified across the ROSS codebase. The primary focus was on adding missing docstrings, correcting parameter descriptions, and ensuring consistent documentation standards for analysis results and elements.

Checkpoints per File:

• ross/bearing_seal_element.py
• ross/coupling_element.py
• ross/disk_element.py
• ross/gear_element.py
• ross/harmonic_balance.py
• ross/materials.py
• ross/model_reduction.py
• ross/multi_rotor.py
• ross/point_mass.py
• ross/probe.py
• ross/results.py
• ross/rotor_assembly.py
• ross/shaft_element.py
• ross/utils.py
• docs/user_guide/tutoriais*.ipynb

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.03%. Comparing base (76d1013) to head (48a94a1).
⚠️ Report is 1 commits behind head on main.
❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1269   +/-   ##
=======================================
  Coverage   78.03%   78.03%           
=======================================
  Files          46       46           
  Lines       13283    13283           
=======================================
  Hits        10366    10366           
  Misses       2917     2917           

Files with missing lines	Coverage Δ
ross/bearing_seal_element.py	89.08% <ø> (ø)
ross/coupling_element.py	85.12% <ø> (ø)
ross/disk_element.py	100.00% <ø> (ø)
ross/element.py	89.70% <ø> (ø)
ross/gear_element.py	79.20% <ø> (ø)
ross/harmonic_balance.py	72.64% <ø> (ø)
ross/model_reduction.py	80.86% <ø> (ø)
ross/point_mass.py	85.71% <ø> (ø)
ross/probe.py	76.47% <ø> (ø)
ross/results.py	76.77% <ø> (ø)
... and 3 more

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 56f624d...48a94a1. Read the comment docs.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.