docs: add release notes

Author: jtobin

docs/release-notes/release-notes-0.8.0.md

@@ -34,6 +34,12 @@
 
 ## RPC Updates
 
+- [PR#1766](https://github.com/lightninglabs/taproot-assets/pull/1766):
+  Introduce structured price oracle errors that allow oracles to return
+  specific error codes marked as public or private, as is appropriate.
+  Also, add a new error code that oracles can use to indicate that an
+  asset is unsupported.
+
 - [PR#1841](https://github.com/lightninglabs/taproot-assets/pull/1841): Remove
   the defaultMacaroonWhitelist map and inline its entries directly
   into the conditional logic within MacaroonWhitelist. This ensures that