Update release notes for 1.89

Author: vissarion

doc/release_notes.qbk

@@ -19,6 +19,29 @@
 
 [section:release_notes Release Notes]
 
+[/=================]
+[heading Boost 1.89]
+[/=================]
+
+[*Major improvements]
+
+* [@https://github.com/boostorg/geometry/pull/1369 1369] Rewrite of traversal
+* [@https://github.com/boostorg/geometry/pull/1402 1402] Add geometry polyhedral surface
+
+[*Improvements]
+
+* [@https://github.com/boostorg/geometry/pull/1404 1404] Performance improvements in buffer
+* [@https://github.com/boostorg/geometry/pull/1405 1405] Avoid static variables and functions in header files
+
+[*Solved issues]
+
+* [@https://github.com/boostorg/geometry/issues/1221 1221] Difference with rectilinear multipolygon with integer coordinates produces invalid polygon with disconnected interior
+* [@https://github.com/boostorg/geometry/issues/1295 1295] Wrong result in intersection (result polygon is equal to the biggest of the input polygons)
+* [@https://github.com/boostorg/geometry/issues/1349 1349] Difference of polygons giving wrong result
+* [@https://github.com/boostorg/geometry/issues/1382 1382] Buffer operation creates self-intersection
+* Various fixes of errors and warnings
+
+
 [/=================]
 [heading Boost 1.88]
 [/=================]