docs: reformat man pages to improve consistency and readability

Change-Id: I4f9afbc73c365dfa31eb6cd1e4a48368b6a9064f
diff --git a/docs/releases.rst b/docs/releases.rst
index 541760e..8afd0e1 100644
--- a/docs/releases.rst
+++ b/docs/releases.rst
@@ -1,5 +1,5 @@
-All NFD Releases
-================
+Release History
+===============
 
 .. toctree::
    :glob: