fix documentation for APT::Periodic::MaxSize "0" (closes: #740551)

debian/apt.cron.daily

@@ -41,7 +41,7 @@
 #  APT::Periodic::MaxSize "0"; (new)
 #  - Set maximum size of the cache in MB (0=disable). If the cache
 #    is bigger, cached package files are deleted until the size
-#    requirement is met (the biggest packages will be deleted 
+#    requirement is met (the oldest packages will be deleted 
 #    first).
 #
 #  APT::Periodic::Update-Package-Lists "0";

doc/examples/configure-index

@@ -149,7 +149,7 @@ APT
     MaxSize "0"; // (new)
     // - Set maximum size of the cache in MB (0=disable). If the cache
     //   is bigger, cached package files are deleted until the size
-    //   requirement is met (the biggest packages will be deleted 
+    //   requirement is met (the oldest packages will be deleted 
     //   first).
 
     Update-Package-Lists "0";