To develop locally, install Rust, and then:
git clone https://github.com/SymmetricDevs/Dev-Docs.git
cd Dev-Docs
cargo install mdbook mdbook-mermaid mdbook-admonish mdbook-linkcheck mdbook-emojicodes
mdbook serve
Or if you're a freak there's the nix flake ;)
For most PRs, however, it's probably not necessary to actually install mdbook and check because it's just Markdown.