docs/release-notes: add release notes entry

Author: Roasbeef

docs/release-notes/release-notes-0.7.0.md

@@ -26,6 +26,12 @@
 - [An integration test flake was
   fixed](https://github.com/lightninglabs/taproot-assets/pull/1651).
 
+- [Invoice tolerance calculations were fixed to properly account for per-HTLC
+  conversion errors](https://github.com/lightninglabs/taproot-assets/pull/1673).
+  This improves the accuracy of asset payment acceptance by correctly modeling
+  rounding errors that accumulate when converting between asset units and
+  millisatoshis across multiple HTLCs.
+
 # New Features
 
 ## Functional Enhancements
@@ -124,4 +130,5 @@
 
 # Contributors (Alphabetical Order)
 
+- George Tsagkarelis
 - Oliver Gugger