servo: Merge #13182 - Fix println section (from paulrouget:fixDoc); r=KiChjang

Source-Repo: https://github.com/servo/servo
Source-Revision: bba3eefde86d7716c35b6dcb6f45c9d42fbe758f

servo/docs/HACKING_QUICKSTART.md

@@ -174,7 +174,7 @@ You will want to add your own logs. Luckily, many structures [implement the `fmt
 println!("foobar: {:?}", foobar)
 ```
 
-usually just works. If it doesn't, maybe foobar's properties implement the right trait.
+usually just works. If it doesn't, maybe some of foobar's properties don't implement the right trait.
 
 ### Debugger