doc rust as repl-capable

Author: michaelb

doc/sources/README.md

@@ -433,7 +433,7 @@ println!("-> {}", alphabet);
 | PHP          | Bloc          | Yes\*\*          |
 | R            | Bloc          | Yes\*\*          |
 | Ruby         | Bloc          | No               |
-| Rust         | Bloc          | No               |
+| Rust         | Bloc          | Yes               |
 | SageMath     | Import        | Yes\*\*          |
 | Scala        | Bloc          | No               |
 | SQL          | Bloc          | No               |