doc/tutorial/basics: include commands to run

To give the user a clue on how to get the output.

Change-Id: I2fb92d08599c95b7b1cbd70e8f41d2760e359c14
Reviewed-on: https://cue-review.googlesource.com/c/1580
Reviewed-by: Marcel van Lohuizen <mpvl@google.com>
diff --git a/doc/tutorial/basics/stringraw.md b/doc/tutorial/basics/stringraw.md
index 6f5b73a..8ea44fa 100644
--- a/doc/tutorial/basics/stringraw.md
+++ b/doc/tutorial/basics/stringraw.md
@@ -13,6 +13,7 @@
 Quotes do not have to be escaped in such strings.
 
 <!-- CUE editor -->
+_stringraw.cue:_
 ```
 msg1: #"The sequence "\U0001F604" renders as \#U0001F604."#
 
@@ -21,11 +22,13 @@
 
         #"\d{3}"#
 
-    This construct works for bytes, strings and their multi-line variants.
+    This construct works for bytes, strings and their
+    multi-line variants.
     """##
 ```
 
 <!-- JSON result -->
+`$ cue eval stringraw.cue`
 ```json
 {
     msg1: "The sequence \"\\U0001F604\" renders as 😄."
@@ -34,7 +37,8 @@
         
             #\"\\d{3}\"#
         
-        This construct works for bytes, strings and their multi-line variants.
+        This construct works for bytes, strings and their
+        multi-line variants.
         """
 }
 ```