[DOCS] Adds ml-cpp PRs to release notes (#59170)

Author: lcawl

docs/reference/release-notes.asciidoc

@@ -5,6 +5,7 @@
 --
 This section summarizes the changes in each release.
 
+* <<release-notes-6.8.11>>
 * <<release-notes-6.8.10>>
 * <<release-notes-6.8.9>>
 * <<release-notes-6.8.8>>

docs/reference/release-notes/6.8.asciidoc

@@ -1,3 +1,16 @@
+[[release-notes-6.8.11]]
+== {es} version 6.8.11
+
+coming::[6.8.11]
+
+[float]
+=== Bug fixes
+
+Machine Learning::
+* Better interrupt handling during named pipe connection {ml-pull}1311[#1311]
+* Trap potential cause of SIGFPE {ml-pull}1351[#1351] (issue: {ml-issue}1348[#1348])
+
+
 [[release-notes-6.8.10]]
 == {es} version 6.8.10