fix(docs): fix avm instruction set table (#7061)

Something changed in latest docusaurus (or in one of its dependencies
like `react-markdown`), and for whatever reason I need to escape
backticks (`) used inside of `<Markdown>` elements.

Basically we are generating an html table, and the opcode names in the
table were surrounded with backticks to make them look like this `ADD`
(probably unnecessary but I liked it). For whatever reason they now need
to be escaped 🤷

[Previewed
here](https://aztec-packages-7xi6jsdgr-davids-projects-7de79886.vercel.app/protocol-specs/public-vm/instruction-set)