The decrement operator is rendered incorrectly because of markdown magic

[thorulf4]

https://github.com/UPPAALModelChecker/docs.uppaal.org/blob/cae0ed8b761a27c054b456c2a0b1d3dd7856ef5e/content/language-reference/expressions/_index.md?plain=1#L84

Because Hugo uses markdown -- is combined into a –

[mikucionisaau]

I'll enclose all those expressions in back-ticks, which enforces monospace font and then they appear correctly.