Small improvement in refinements docs

Move general statement about refinements of modules
from example to the top of the document.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66530 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

doc/syntax/refinements.rdoc

@@ -7,7 +7,7 @@ changes.  This can cause unintended side-effects or breakage of programs.
 
 Refinements are designed to reduce the impact of monkey patching on other
 users of the monkey-patched class.  Refinements provide a way to extend a
-class locally.
+class locally.  Refinements can modify both classes and modules.
 
 Here is a basic refinement:
 
@@ -26,7 +26,7 @@ Here is a basic refinement:
   end
 
 First, a class +C+ is defined.  Next a refinement for +C+ is created using
-Module#refine. Refinements can modify both classes and modules.
+Module#refine.
 
 Module#refine creates an anonymous module that contains the changes or
 refinements to the class (+C+ in the example).  +self+ in the refine block is