Update Revision History September 2025 (google#582)

* Update revision-history.md

* added full stops

---------

Co-authored-by: Skander Chouchene <skander@mobilitydata.org>

Author: Sergiodero

gtfs/spec/en/revision-history.md

@@ -1,5 +1,9 @@
 ### Revision History
 
+#### September 2025
+* Added `cemv_support` field in `agency.txt` and `routes.txt`. See [discussion](https://github.com/google/transit/pull/545).
+* Added `stop_access` field in `stops.txt`. See [discussion](https://github.com/google/transit/pull/515).
+
 #### June 2025
 * Added cars_allowed field to trips.txt. See [discussion](https://github.com/google/transit/pull/547).