doc: add release note

Author: tgilon

doc/release_notes.md

@@ -31,6 +31,8 @@
 
 **Bugfixes and Compatibility**
 
+* Extend `tyndp-archive` support to integrate three new datasets (`desnz_electricity_consumption`, `jrc_energy_atlas`, `ons_lad`) and two new versions (`nitrogen_statistics`, `synthetic_electricity_demand`) ([#758](https://github.com/open-energy-transition/open-tyndp/pull/758)).
+
 **Documentation**
 
 * Update benchmarking documentation tables and figures for v0.7.1 ([#711](https://github.com/open-energy-transition/open-tyndp/pull/711)).