make VMEC load docstring more clear about what it is doing

[dpanici]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.98%. Comparing base (5d3af14) to head (8e51ddc).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1091   +/-   ##
=======================================
  Coverage   94.98%   94.98%           
=======================================
  Files          87       87           
  Lines       21743    21743           
=======================================
  Hits        20652    20652           
  Misses       1091     1091           

Files	Coverage Δ
desc/vmec.py	92.21% <ø> (ø)

[github-actions]

|             benchmark_name             |         dt(%)          |         dt(s)          |        t_new(s)        |        t_old(s)        | 
| -------------------------------------- | ---------------------- | ---------------------- | ---------------------- | ---------------------- |
 test_build_transform_fft_lowres         |     -1.76 +/- 5.17     | -9.85e-03 +/- 2.89e-02 |  5.48e-01 +/- 2.2e-02  |  5.58e-01 +/- 1.9e-02  |
 test_build_transform_fft_midres         |     -1.54 +/- 2.75     | -9.91e-03 +/- 1.77e-02 |  6.34e-01 +/- 1.1e-02  |  6.44e-01 +/- 1.4e-02  |
 test_build_transform_fft_highres        |     +0.25 +/- 3.03     | +2.60e-03 +/- 3.11e-02 |  1.03e+00 +/- 2.1e-02  |  1.03e+00 +/- 2.3e-02  |
 test_equilibrium_init_lowres            |     +0.74 +/- 2.50     | +2.98e-02 +/- 1.01e-01 |  4.07e+00 +/- 8.4e-02  |  4.04e+00 +/- 5.7e-02  |
 test_equilibrium_init_medres            |     -0.68 +/- 2.46     | -3.13e-02 +/- 1.13e-01 |  4.58e+00 +/- 8.5e-02  |  4.61e+00 +/- 7.5e-02  |
 test_equilibrium_init_highres           |     +0.51 +/- 1.91     | +3.02e-02 +/- 1.13e-01 |  5.97e+00 +/- 7.6e-02  |  5.94e+00 +/- 8.4e-02  |
 test_objective_compile_dshape_current   |     -0.02 +/- 1.97     | -9.50e-04 +/- 7.83e-02 |  3.98e+00 +/- 5.0e-02  |  3.98e+00 +/- 6.1e-02  |
 test_objective_compile_atf              |     -1.49 +/- 3.98     | -1.28e-01 +/- 3.41e-01 |  8.46e+00 +/- 2.7e-01  |  8.58e+00 +/- 2.1e-01  |
 test_objective_compute_dshape_current   |     -1.10 +/- 3.46     | -1.41e-05 +/- 4.45e-05 |  1.27e-03 +/- 2.9e-05  |  1.29e-03 +/- 3.4e-05  |
 test_objective_compute_atf              |     +3.85 +/- 7.18     | +1.72e-04 +/- 3.21e-04 |  4.64e-03 +/- 2.0e-04  |  4.46e-03 +/- 2.5e-04  |
 test_objective_jac_dshape_current       |     -0.40 +/- 7.11     | -1.54e-04 +/- 2.75e-03 |  3.85e-02 +/- 1.7e-03  |  3.86e-02 +/- 2.2e-03  |
 test_objective_jac_atf                  |     +1.28 +/- 2.07     | +2.43e-02 +/- 3.93e-02 |  1.92e+00 +/- 2.7e-02  |  1.90e+00 +/- 2.9e-02  |
 test_perturb_1                          |     +2.39 +/- 1.81     | +3.27e-01 +/- 2.48e-01 |  1.40e+01 +/- 5.0e-02  |  1.37e+01 +/- 2.4e-01  |
 test_perturb_2                          |     -0.19 +/- 1.78     | -3.65e-02 +/- 3.45e-01 |  1.93e+01 +/- 1.9e-01  |  1.94e+01 +/- 2.9e-01  |
 test_proximal_jac_atf                   |     +0.58 +/- 1.47     | +4.31e-02 +/- 1.10e-01 |  7.49e+00 +/- 6.2e-02  |  7.44e+00 +/- 9.0e-02  |
 test_proximal_freeb_compute             |     +0.40 +/- 0.94     | +7.05e-04 +/- 1.67e-03 |  1.79e-01 +/- 1.0e-03  |  1.78e-01 +/- 1.3e-03  |
 test_proximal_freeb_jac                 |     -1.40 +/- 1.81     | -1.06e-01 +/- 1.38e-01 |  7.50e+00 +/- 5.3e-02  |  7.60e+00 +/- 1.3e-01  |
 test_solve_fixed_iter                   |     +0.69 +/- 7.19     | +1.07e-01 +/- 1.11e+00 |  1.56e+01 +/- 8.1e-01  |  1.55e+01 +/- 7.6e-01  |