Fixes to the english version

Author: SableRaf

content/pages/people/index.mdx

@@ -12,8 +12,8 @@ title: 'People'
 - [Andres Colubri](https://andrescolubri.net/) (Boston), OpenGL / Video
 - [Samuel Pottinger](https://github.com/sampottinger) (San Francisco), Processing Core
 - [Raphaël de Courville](https://twitter.com/sableraph) (Berlin), Processing Website
-- [Stef Tervelde](https://github.com/steft) (Berlin), Infrastructure and Developer Experience
-- [Kevin Staedler](https://github.com/kevinstaedler) (Vienna), Processing Sound
+- [Stef Tervelde](https://github.com/stefterv) (Berlin), Infrastructure and Developer Experience
+- [Kevin Staedler](https://github.com/kevinstadler) (Vienna), Processing Sound
 
 ## Libraries, Tools