Fix documentation build errors.

[kklein]

Currently, building the documentation with sphinx triggers the following errors:

/Users/kevin/Code/datajudge/src/datajudge/requirements.py:docstring of datajudge.requirements.BetweenRequirement.add_row_equality_constraint:4: ERROR: Undefined substitution referenced: "T1 - T2".
/Users/kevin/Code/datajudge/src/datajudge/requirements.py:docstring of datajudge.requirements.BetweenRequirement.add_row_equality_constraint:4: ERROR: Undefined substitution referenced: "T2 - T1".
/Users/kevin/Code/datajudge/src/datajudge/requirements.py:docstring of datajudge.requirements.BetweenRequirement.add_row_equality_constraint:4: ERROR: Undefined substitution referenced: "T1 U T2".
/Users/kevin/Code/datajudge/src/datajudge/requirements.py:docstring of datajudge.requirements.BetweenRequirement.add_row_subset_constraint:4: ERROR: Undefined substitution referenced: "T1-T2".
/Users/kevin/Code/datajudge/src/datajudge/requirements.py:docstring of datajudge.requirements.BetweenRequirement.add_row_subset_constraint:4: ERROR: Undefined substitution referenced: "T1".
/Users/kevin/Code/datajudge/src/datajudge/requirements.py:docstring of datajudge.requirements.BetweenRequirement.add_row_subset_constraint:7: ERROR: Undefined substitution referenced: "T1-T2".
/Users/kevin/Code/datajudge/src/datajudge/requirements.py:docstring of datajudge.requirements.BetweenRequirement.add_row_superset_constraint:4: ERROR: Undefined substitution referenced: "T2-T1".
/Users/kevin/Code/datajudge/src/datajudge/requirements.py:docstring of datajudge.requirements.BetweenRequirement.add_row_superset_constraint:4: ERROR: Undefined substitution referenced: "T2".

This is due to rst relying on | as a marker for substitutions[0]. We could simply escape the characters and leave the notation as is. Since the errors stem from examples which would profit from a math representation anyway, I wrapped them in latex, which

• Made the errors go away
• Hopefully improves the user experience in comparison to pseudo code

[0] https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html#substitutions

[codecov]

Codecov Report

Merging #50 (2ae93af) into main (b899598) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #50   +/-   ##
=======================================
  Coverage   93.90%   93.90%           
=======================================
  Files          15       15           
  Lines        1607     1607           
=======================================
  Hits         1509     1509           
  Misses         98       98           

Impacted Files	Coverage Δ
src/datajudge/requirements.py	94.50% <ø> (ø)

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