Update well known traits table

Author: nathanwhit

book/src/clauses/well_known_traits.md

@@ -34,10 +34,11 @@ Some common examples of auto traits are `Send` and `Sync`.
 | structs         | ⚬    | ⚬    |  ✅    | ✅     | ⚬    | ⚬  |  ⚬      |  ⚬       |   ✅         |
 | scalar types    | 📚    | 📚    | ✅     | ⚬     | ⚬   |  ⚬  |  ⚬     |  ⚬       |    ❌        |
 | str             | 📚    | 📚    | ⚬     | ⚬     | ⚬   |  ⚬  |  ⚬     |  ⚬       |    ❌        |
+| never type      | 📚   |  📚   |  ✅   |  ⚬    |  ⚬    | ⚬   |   ⚬    |  ⚬       |   ❌       |
 | trait objects   | ⚬    | ⚬    | ⚬     |  ✅    | ⚬    | ⚬   | ⚬      |  ⚬       |    ⚬        |
 | functions ptrs  | ✅    | ✅    | ✅     | ⚬     | ⚬    | ❌   | ⚬      |  ⚬       |    ❌         |
-| raw ptrs        | ✅   |  ✅  |   ✅   |  ⚬    |   ⚬   |  ⚬  |   ⚬    |   ⚬      |      ❌      |
-| immutable refs  | ✅   |  ✅  |   ✅   |  ⚬    |   ⚬   |  ⚬  |   ⚬    |   ⚬      |      ❌      |
+| raw ptrs        | 📚   |  📚  |   ✅   |  ⚬    |   ⚬   |  ⚬  |   ⚬    |   ⚬      |      ❌      |
+| immutable refs  | 📚   |  📚  |   ✅   |  ⚬    |   ⚬   |  ⚬  |   ⚬    |   ⚬      |      ❌      |
 | mutable refs    | ⚬    |  ⚬   |   ✅   |  ⚬    |   ⚬   |  ⚬  |   ⚬    |   ⚬      |      ❌      |
 | slices          | ⚬     | ⚬    | ⚬     |   ✅    | ⚬   | ⚬   | ⚬      |  ⚬       |    ❌       |
 | arrays❌         | ❌     | ❌    | ❌     | ❌      | ⚬   | ⚬   | ⚬      |  ⚬       |    ❌        |