false positive Mathjax.document warning

[zsviczian]

let html: ReturnType<typeof mathjax.document> | null = null;

https://github.com/zsviczian/obsidian-excalidraw-extras/blob/a6d7447d714c1225c997cf215addafb27f77c71f/src/MathjaxToSVG/index.ts#L23

[cybaea]

For the maintainers: this is similar to #150 .