Update molecules doc import

[munrojm]

Fixes the document model import in the MoleculesRester

[codecov-commenter]

Codecov Report

Merging #598 (b5f86f7) into main (a4933b5) will decrease coverage by 0.70%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #598      +/-   ##
==========================================
- Coverage   92.17%   91.46%   -0.71%     
==========================================
  Files          34       35       +1     
  Lines        1380     1395      +15     
==========================================
+ Hits         1272     1276       +4     
- Misses        108      119      +11     

Impacted Files	Coverage Δ
src/mp_api/routes/molecules.py	93.10% <100.00%> (ø)
src/mp_api/routes/charge_density.py	79.10% <0.00%> (-7.47%)	⬇️
src/mp_api/client.py	89.77% <0.00%> (-1.90%)	⬇️
src/mp_api/routes/materials.py	74.57% <0.00%> (ø)
src/mp_api/core/utils.py	87.50% <0.00%> (ø)
src/mp_api/routes/summary.py	98.11% <0.00%> (+0.03%)	⬆️
src/mp_api/routes/thermo.py	97.22% <0.00%> (+0.07%)	⬆️
src/mp_api/core/client.py	91.15% <0.00%> (+0.08%)	⬆️
src/mp_api/routes/grain_boundary.py	97.14% <0.00%> (+0.08%)	⬆️
src/mp_api/routes/xas.py	92.85% <0.00%> (+0.26%)	⬆️

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