fix(developer-guide-gateway) Fix broken link to Vert.x connector.
fix(developer-guide-gateway) Fix broken link to Vert.x connector.

Fix syntax errors in examples causing highlighting overflow in IDE

apiman/apiman,apiman/apiman,msavy/apiman,apiman/apiman-guides,apiman/apiman,msavy/apiman,msavy/apiman,msavy/apiman,msavy/apiman,apiman/apiman,apiman/apiman