Linebreak processing in MathML in Presentation XML: https://github.co…

[opoudjis]

…m/metanorma/metanorma-standoc/issues/111

Metanorma PR checklist

• [ ] Breaking changes (list related PRs)
• [ ] Documentation update required (create task for this)
• [ ] External dependency introduced (documentation update need)
• [ ] Gem with native library introduced

[codecov[bot]]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (08f0d10) 95.77% compared to head (ae0c666) 95.83%. Report is 1 commits behind head on main.

Files	Patch %	Lines
lib/isodoc/presentation_function/metadata.rb	97.59%	2 Missing :warning:
lib/isodoc/presentation_function/math.rb	93.33%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #556 +/- ## ========================================== + Coverage 95.77% 95.83% +0.05% ========================================== Files 77 78 +1 Lines 5379 5403 +24 ========================================== + Hits 5152 5178 +26 + Misses 227 225 -2 ```

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