clarify the shard_param example a bit

parent 1bb39901
......@@ -636,7 +636,7 @@ implement retries on alternative backends::
sub vcl_backend_fetch {
# changes dir_A and dir_B behaviour
shard_param.set(alt=bereq.retries);
shard_param.set(alt=bereq.retries, by=URL);
}
$Method VOID .clear()
......
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