Update CHANGELOG.md

Author: stephprince

CHANGELOG.md

@@ -2,8 +2,9 @@
 
 ## Unreleased
 
-- Fixed parsing of the nwb_version attribute which followed the previous suggestion to have  a `NWB-` prefix.
-  @t-b [#2116](https://github.com/NeurodataWithoutBorders/pynwb/pull/2116)
+### Fixed
+- Fixed parsing of the nwb_version attribute which followed the previous suggestion to have a `NWB-` prefix.
+  @t-b [#2118](https://github.com/NeurodataWithoutBorders/pynwb/pull/2118)
 
 ## PyNWB 3.1.1 (July 22, 2025)