Replaced a "buffered" with a "cached"

draft-ietf-httpbis-rand-access-live.xml

@@ -470,7 +470,7 @@ Content-Range: bytes 1020000-1254567/*
           which portion of the representation is being returned in the response body. However 
           GET requests without a Range header cannot be cached since the first byte of the response 
           body can vary from request to request. To ensure Range-less GET requests against 
-          shift-buffer representations are not buffered, servers hosting a shift-buffer 
+          shift-buffer representations are not cached, servers hosting a shift-buffer 
           representation should either not return a 200-level response (e.g. sending a 
           300-level redirect response with a URI that represents the current start of the 
           shift-buffer) or indicate the response is non-cacheable. See HTTP Caching