Update SPEC.rdoc

Co-authored-by: Jeremy Evans <code@jeremyevans.net>

Author: ioquatix

SPEC.rdoc

@@ -239,7 +239,7 @@ If the Body responds to +to_path+, it must return either +nil+ or a +String+. If
 
 ==== Enumerable Body
 
-The Enumerable Body must respond to +each+. It must only be consumed once (calling this method consumes the body). It must not be called after being closed, and must only yield +String+ values.
+The Enumerable Body must respond to +each+, which must not be called more than once, and must not be called after being closed. The +each+ method must only yield +String+ values.
 
 Middleware must not call +each+ directly on the Body. Instead, middleware can return a new Body that calls +each+ on the original Body, yielding at least once per iteration.