Mention array sugar in guide

Manishearth · Sep 25, 2014 · 1f4cd80 · 1f4cd80 · steveklabnik · Sep 25, 2014
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diff --git a/src/doc/guide.md b/src/doc/guide.md
@@ -1507,6 +1507,7 @@ You can create an array with just square brackets:
 
 ```{rust}
 let nums = [1i, 2i, 3i];
+let nums = [1i, ..20]; // Shorthand for an array of 20 elements all initialized to 1
 ```
 
 So what's the difference? An array has a fixed size, so you can't add or