revise: add ✨ to titles

SPEC.md

@@ -39,7 +39,7 @@ Revisions to this specification are made periodically in order to correct errors
         - [Map\[P, Y\]](#mapp-y)
         - [🗑 Object](#-object)
         - [Custom Types (Structs)](#custom-types-structs)
-        - [Enumeration Types (Enums)](#enumeration-types-enums)
+        - [✨ Enumeration Types (Enums)](#-enumeration-types-enums)
       - [Hidden and Scoped Types](#hidden-and-scoped-types)
         - [`Union` (Hidden Type)](#union-hidden-type)
         - [`hints`, `input`, and `output` (Scoped Types)](#hints-input-and-output-scoped-types)
@@ -74,7 +74,7 @@ Revisions to this specification are made periodically in order to correct errors
   - [WDL Documents](#wdl-documents)
   - [Versioning](#versioning)
   - [Struct Definition](#struct-definition)
-  - [Enum Definition](#enum-definition)
+  - [✨Enum Definition](#-enum-definition)
     - [Enum Usage](#enum-usage)
   - [Import Statements](#import-statements)
     - [Import URIs](#import-uris)
@@ -199,8 +199,8 @@ Revisions to this specification are made periodically in order to correct errors
     - [`contains_key`](#-contains_key)
     - [`values`](#-values)
     - [`collect_by_key`](#collect_by_key)
-  - [Enum Functions](#enum-functions)
-    - [`variants`](#variants)
+  - [✨Enum Functions](#enum-functions)
+    - [✨`variants`](#variants)
   - [Other Functions](#other-functions)
     - [`defined`](#defined)
     - [`length`](#length)
@@ -11304,7 +11304,7 @@ Example output:
 </p>
 </details>
 
-## Enum Functions
+## ✨ Enum Functions
 
 ### ✨ `variants`