docs: release-notes: Add note on fixed nordic boards

Adds a note that building for these boards has been fixed

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>
diff --git a/docs/release-notes.d/fix-nordic.md b/docs/release-notes.d/fix-nordic.md
new file mode 100644
index 0000000..9706f8a
--- /dev/null
+++ b/docs/release-notes.d/fix-nordic.md
@@ -0,0 +1,2 @@
+- Fixed errors when building for ``thingy52``, ``thingy53`` and
+  ``nrf9160dk`` boards.