coafile.rst: Fix bad code markup

Fixes #499

Author: Naveenaidu

Users/coafile.rst

@@ -93,7 +93,7 @@ This is the same file without section inheritance::
 All settings must be part of a section, so don't do this for implicit
 inheritance (this is also deprecated behavior). Implicit inheritance
 was leading to a section automatically getting inherited to all other
-sections without semantically making sense.
+sections without semantically making sense::
 
   # bad!
   setting1 = 1