Fix doc rst syntax.

slapos/recipe/cmmi/README.txt

@@ -879,10 +879,10 @@ In these options magic prefix can be represented by %(prefix)s:
     ``make-binary`` ``make-options`` ``make-targets``
     ``pre-configure`` ``pre-build`` ``pre-install`` ``post-install``
 
-For example,
+For example::
 
-[bzip2]
-post-install = rm %(prefix)s/*.h
+  [bzip2]
+  post-install = rm %(prefix)s/*.h
 
 The other part can refer to magic prefix of this part by
 ${part:prefix}, it will return the magic prefix, other than literal