doc/tutorial/basics: fix typo

Change-Id: I72649949094f26a72d0d51748b15ca06f240c8d8
Reviewed-on: https://cue-review.googlesource.com/c/1562
Reviewed-by: Marcel van Lohuizen <mpvl@google.com>
diff --git a/doc/tutorial/basics/bytes.md b/doc/tutorial/basics/bytes.md
index ce11d7f..7fc7146 100644
--- a/doc/tutorial/basics/bytes.md
+++ b/doc/tutorial/basics/bytes.md
@@ -10,7 +10,7 @@
 The following additional escape sequences are allowed in byte literals:
 
     \xnn    // arbitrary byte value defined as a 2-digit hexadecimal number
-    \0nnn   // arbitrary byte value defined as a 3-digit octal number
+    \nnn   // arbitrary byte value defined as a 3-digit octal number
 <!-- jba: this contradicts the spec, which has \nnn (no leading zero) -->
 
 <!-- CUE editor -->