Updating the manuscript for the scoringutils paper

[nikosbosse]

Description

Opening this PR to check for conflicts.

Checklist

• My PR is based on a package issue and I have explicitly linked it.
• I have included the target issue or issues in the PR title as follows: issue-number: PR title
• I have tested my changes locally.
• I have added or updated unit tests where necessary.
• I have updated the documentation if required.
• I have built the package locally and run rebuilt docs using roxygen2.
• My code follows the established coding standards and I have run lintr::lint_package() to check for style issues introduced by my changes.
• I have added a news item linked to this PR.
• I have reviewed CI checks for this PR and addressed them as far as I am able.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d761257) 81.78% compared to head (c17af10) 81.78%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #528   +/-   ##
========================================
  Coverage    81.78%   81.78%           
========================================
  Files           20       20           
  Lines         1713     1713           
========================================
  Hits          1401     1401           
  Misses         312      312           

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