service/dynamodb/expression: Fixup NameBuilder example doc
Fixes typo in NameBuilder.NamesList example documentation to use the
correct variable name.
@@ -23,8 +23,9 @@ type ProjectionBuilder struct {
//
// // Used in another Projection Expression
// anotherProjection := expression.AddNames(projection, expression.Name("baz"))
+//
// // Used to make an Builder
-// builder := expression.NewBuilder().WithProjection(newProjection)
+// builder := expression.NewBuilder().WithProjection(anotherProjection)
//
// Expression Equivalent:
//
