fix: corrects example

Author: claymcleod

SPEC.md

@@ -11327,15 +11327,15 @@ Example: variants.wdl
 ```wdl
 version 1.3
 
-Enum file_type = {
+enum FileType {
   FASTQ,
   SAM,
   BAM,
   CRAM
 }
 
 workflow variants {
-  scatter(type in variants(file_type)) {
+  scatter(type in variants(FileType)) {
     call say_file_type { type }
   }