Update src/guides/getting-started.md
Update src/guides/getting-started.md

Co-authored-by: Yuki Okushi <0a792b09e3c7d426e6dc7b64bc4e95f557d97c14@2k36.org>
sgrif/diesel.rs-website,sgrif/diesel.rs-website,sgrif/diesel.rs-website