fix doc of espresso.py

[yw-fang]

Since it's relevant to Quantum Espresso, the "INCAR" used for VASP was removed to avoid confusion.
Feel free to reject this pull request because it's just a small fix of the document.

Summary of Changes

Since it's relevant to Quantum Espresso, the "INCAR" used for VASP was removed to avoid confusion.

Requirements

• My PR is focused on a single feature addition or bugfix.
• My PR has relevant, comprehensive unit tests.
• My PR is on a custom branch (i.e. is not named main).

Note: If you are an external contributor, you will see a comment from @buildbot-princeton. This is solely for the maintainers.

[buildbot-princeton]

Can one of the admins verify this patch?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.41%. Comparing base (97b5923) to head (636c94b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2485   +/-   ##
=======================================
  Coverage   97.41%   97.41%           
=======================================
  Files          85       85           
  Lines        3518     3518           
=======================================
  Hits         3427     3427           
  Misses         91       91           

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[Andrew-S-Rosen]

Thanks!