CLDR-17830 BRS add MF2 reference, Markdown for site

docs/site/downloads/cldr-46.md

@@ -41,7 +41,9 @@ For a full listing, see [Coverage Levels](https://unicode.org/cldr/charts/46/sup
 
 ## [Specification Changes](http://www.unicode.org/reports/tr35/tr35.html)
 
-**TBD**
+**TBD: Add the specification changes by Sept 25**
+
+**Note: This will include Message Format 2.0 specification changes. A draft is at https://github.com/unicode-org/message-format-wg/tree/main/spec**
 
 ## Data Changes
 
@@ -139,6 +141,12 @@ where only the traditional forms of radicals are now available as index characte
 
 **TBD**
 
+### Markdown ###
+
+The CLDR site is in the process of being moved to markdown source (GFM),
+which will regularize the formatting and make it easier to maintain and extend than with Google Sites.
+The URLs will remain the same.
+
 ### File Changes
 
 All files added in this release were for new locales.
@@ -159,7 +167,7 @@ The additional locales at given levels are listed at the top of this document.
 
 ![Screenshot 2024-09-03 at 17 38 52](https://github.com/user-attachments/assets/7cd0a35f-b46f-4891-8f1a-5d0fd7ebfcc3)
 
-**TBD: Question: is it useful to have this section anymore? **
+**TBD: Question: is it useful to have this section anymore?**
 
 ## Migration