docs: fix syntax highlighting of code blocks

And various other cleanups

Change-Id: I240badc5358c09f006c2a22d4706ce373f2dd188
diff --git a/docs/manpages/nfd.rst b/docs/manpages/nfd.rst
index b87c0f3..a3ed42b 100644
--- a/docs/manpages/nfd.rst
+++ b/docs/manpages/nfd.rst
@@ -1,12 +1,10 @@
 nfd
 ===
 
-Usage
------
+Synopsis
+--------
 
-::
-
-    nfd [options]
+**nfd** [**-h**] [**-V**] [**-c** *file*] [**-m**]
 
 Description
 -----------