doc/tutorial: fix typos

Closes #48
https://github.com/cuelang/cue/pull/48

GitOrigin-RevId: 449f1141b006d64795da5fb0b12d7a0447edca16
Change-Id: I445ee911e372644e6ee90589acdf5517d7d06f94
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/2140
Reviewed-by: Marcel van Lohuizen <mpvl@google.com>
diff --git a/doc/tutorial/basics/stringraw.md b/doc/tutorial/basics/stringraw.md
index 8ea44fa..cb0c903 100644
--- a/doc/tutorial/basics/stringraw.md
+++ b/doc/tutorial/basics/stringraw.md
@@ -29,7 +29,7 @@
 
 <!-- JSON result -->
 `$ cue eval stringraw.cue`
-```json
+```
 {
     msg1: "The sequence \"\\U0001F604\" renders as 😄."
     msg2: """