Update filter_mod.rst

[ann-norcio]

Description:

Corrected documentation for output_forward_op_errors output

Fixes issue

fixes https://github.com/NCAR/DART/issues/530

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [X] Documentation update

Documentation changes needed?

• [ ] My change requires a change to the documentation.
  • [X] I have updated the documentation accordingly.

Tests

subroutine verbose_forward_op_output: do i = 1, ens_size do j = 1, qc_ens_handle%my_num_vars if(nint(qc_ens_handle%copies(i, j)) /= 0) write(forward_unit, *) i, keys(j), nint(qc_ens_handle%copies(i, j)) end do end do

Checklist for merging

• [ ] Updated changelog entry
• [X] Documentation updated
• [ ] Update conf.py

Checklist for release

• [ ] Merge into main
• [ ] Create release from the main branch with appropriate tag
• [ ] Delete feature-branch

Testing Datasets

• [ ] Dataset needed for testing available upon request
• [ ] Dataset download instructions included
• [X] No dataset needed

[ann-norcio]

Thanks Helen, made these changes.