Update docs/What about Glass/02-digital.md

docs/What about Glass/02-digital.md

 # 02 | DIGITALITY
-**02 |** GLASS & DIGITALITY *How does glass work is happening in our digital context ?*
+**02 |** GLASS & DIGITALITY *How is glass work happening in our digital context ?*
 Going digital for glass seems pretty far away from the reality of this material. However, there is something in the transparency of glass that somehow connects with digital. The sensation that it always escapes through light and surprising effects into a non tangible world, a bit like a digital feeling.
 
 ## Digital processes to tangible objects