Update template fields

Update some templated fields that were missed before merging the RFC

Author: mjwolf

rfcs/text/0044-add-apple-platform-specific-fields.md

@@ -1,8 +1,8 @@
-# 0000: Name of RFC
+# 0044: Apple Platform specific fields
 <!-- Leave this ID at 0000. The ECS team will assign a unique, contiguous RFC number upon merging the initial stage of this RFC. -->
 
 - Stage: **0 (strawperson)** <!-- Update to reflect target stage. See https://elastic.github.io/ecs/stages.html -->
-- Date: **TBD** <!-- The ECS team sets this date at merge time. This is the date of the latest stage advancement. -->
+- Date:  **2024-08-13** <!-- The ECS team sets this date at merge time. This is the date of the latest stage advancement. -->
 
 
 ### Summary