Merge pull request hashicorp#593 from RULCSoft/typo-fix

Reviewed! Thanks for the submission!

traversal_for_expr.go

@@ -16,7 +16,7 @@ package hcl
 //
 // In most cases the calling application is interested in the value
 // that results from an expression, but in rarer cases the application
-// needs to see the the name of the variable and subsequent
+// needs to see the name of the variable and subsequent
 // attributes/indexes itself, for example to allow users to give references
 // to the variables themselves rather than to their values. An implementer
 // of this function should at least support attribute and index steps.