Rework Project Euler 72

Editor assessment

The subject clearly identifies the target, a rework of Project Euler 72, with an appropriate fix type and curriculum scope. The body lists four squash bullets: reworking the challenge to use an argument, adding a solution, using MathJax for fractions, and fixing missing backticks. That enumerates the what in some detail but never the why; a reader learns what changed, not what was wrong with the previous version or what trade-offs were made. The PR reference is well formed and nothing is pasted or malformed. Style is acceptable. The message is valid and followable but reads as a change log, so its teaching value is mediocre.