hcl: update stale references to "zcl"

hcl/ops.go

@@ -8,7 +8,7 @@ import (
 )
 
 // Index is a helper function that performs the same operation as the index
-// operator in the zcl expression language. That is, the result is the
+// operator in the HCL expression language. That is, the result is the
 // same as it would be for collection[key] in a configuration expression.
 //
 // This is exported so that applications can perform indexing in a manner

hcl/traversal_for_expr.go

@@ -43,7 +43,7 @@ func AbsTraversalForExpr(expr Expression) (Traversal, Diagnostics) {
 }
 
 // RelTraversalForExpr is similar to AbsTraversalForExpr but it returns
-// a relative traversal instead. Due to the nature of ZCL expressions, the
+// a relative traversal instead. Due to the nature of HCL expressions, the
 // first element of the returned traversal is always a TraverseAttr, and
 // then it will be followed by zero or more other expressions.
 //