updated to use WSF_STRING.value instead of obsolete WSF_STRING.string

draft/library/server/request/rest/src/contrib/doc/rest_api_documentation.e

@@ -37,7 +37,7 @@ feature -- Access
 	resource_value (ctx: C): detachable READABLE_STRING_32
 		do
 			if attached {WSF_STRING} ctx.item ("resource") as s then
-				Result := s.string
+				Result := s.value
 			end
 		end
 

library/server/wsf/router/wsf_handler_context.e

@@ -188,7 +188,7 @@ feature -- Convertion
 			-- String value from `a_value' if relevant.
 		do
 			if attached {WSF_STRING} a_value as val then
-				Result := val.string
+				Result := val.value
 			end
 		end