docs: improve formatting and document structure

Change-Id: I530d58f2700eb264855843021db32f568d373a1d
diff --git a/docs/release-notes/release-notes-0.6.0.rst b/docs/release-notes/release-notes-0.6.0.rst
index 1701c67..04c17c1 100644
--- a/docs/release-notes/release-notes-0.6.0.rst
+++ b/docs/release-notes/release-notes-0.6.0.rst
@@ -1,10 +1,12 @@
 NLSR version 0.6.0
-++++++++++++++++++
+------------------
 
-**Improvements and Bug Fixes**
+Improvements and bug fixes
+^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-- **breaking change** Major changes in the TLV structure and classes. Reduced codebase size and
-  improved compilation times. LSA de/serialize functions are replaced by wireEncode/Decode. Updated LSA
-  wire formats and TLV assignments. Updated nlsrc to print using the new encoding. (:issue:`4787`, :issue:`5116`)
+- *(breaking change)* Major changes in the TLV structure and classes. Reduced codebase size and
+  improved compilation times. LSA de/serialize functions are replaced by wireEncode/Decode.
+  Updated LSA wire formats and TLV assignments. Updated nlsrc to print using the new encoding.
+  (:issue:`4787`, :issue:`5116`)
 - LSDB refactor: switch to ``boost::multi_index`` to replace 3 LSA lists (:issue:`4127`)
 - Fix wrong reaction on hello Interest timeout (:issue:`5139`)