Avoid horizontal scrollbar in block comment example in Chapter 2

Author: marijnh

02_program_structure.md

@@ -872,10 +872,10 @@ information about a file or a chunk of program.
 
 ```
 /*
-  I first found this number scrawled on the back of an old notebook.
-  Since then, it has often dropped by, showing up in phone numbers
-  and the serial numbers of products that I've bought. It obviously
-  likes me, so I've decided to keep it.
+  I first found this number scrawled on the back of an old
+  notebook. Since then, it has often dropped by, showing up in
+  phone numbers and the serial numbers of products that I've
+  bought. It obviously likes me, so I've decided to keep it.
 */
 const myNumber = 11213;
 ```