fix the documentation

[hadim]

Checklist:

• [ ] Add tests to cover the fixed bug(s) or the new introduced feature(s) (if appropriate).
• [x] Update the API documentation is a new function is added or an existing one is deleted.
• [x] Added a news entry.
  • copy news/TEMPLATE.rst to news/my-feature-or-branch.rst) and edit it.

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[codecov[bot]]

Codecov Report

Merging #110 (e77a345) into main (fafdba8) will not change coverage. The diff coverage is n/a.

:exclamation: Current head e77a345 differs from pull request most recent head 61a0246. Consider uploading reports for the commit 61a0246 to get more accurate results

@@           Coverage Diff           @@
##             main     #110   +/-   ##
=======================================
  Coverage   83.84%   83.84%           
=======================================
  Files          48       48           
  Lines        3472     3472           
=======================================
  Hits         2911     2911           
  Misses        561      561           

Flag	Coverage Δ
unittests	83.84% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
datamol/mol.py	96.69% <ø> (ø)

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