docs: improve formatting and document structure

Change-Id: I4b0b4cc3eae000aa1c988c5d308c3f78052ad96d
diff --git a/docs/release-notes/release-notes-0.3.0.rst b/docs/release-notes/release-notes-0.3.0.rst
index 20c9360..ea9a61d 100644
--- a/docs/release-notes/release-notes-0.3.0.rst
+++ b/docs/release-notes/release-notes-0.3.0.rst
@@ -8,18 +8,22 @@
 This effectively drops official support for Ubuntu 16.04 when using distribution-provided Boost
 packages -- PSync may still work on this platform, but we provide no official support for it.
 
-We have taken some steps to be endian safe but PSync is not completely endian safe yet (:issue:`4818`)
-
 New features
 ^^^^^^^^^^^^
 
-- **breaking** Consumer: change hello data callback to include sequence number (:issue:`5122`)
+- *(breaking change)* Consumer: change hello data callback to include sequence number (:issue:`5122`)
 
 Improvements and bug fixes
 ^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-- **breaking** IBLT: make encoding endian safe (:issue:`5076`)
+- *(breaking change)* IBLT: make encoding endian safe (:issue:`5076`)
 - Reset cached wire encoding after adding names (:issue:`5083`)
-- Consumer reacts faster on sync Interest timeout (:issue:`5124`)
+- Consumer reacts faster on Sync Interest timeout (:issue:`5124`)
 - Move private classes and functions to ``psync::detail`` namespace
 - Improved unit tests
+
+Known issues
+^^^^^^^^^^^^
+
+- We have taken some steps to be endian safe but PSync is not completely endian safe yet
+  (:issue:`4818`)