element.py: Add link to SandboxFlags in docs for Element.batch_prepare_assemble()
diff --git a/src/buildstream/element.py b/src/buildstream/element.py
index 091b5d2..ee3b2fc 100644
--- a/src/buildstream/element.py
+++ b/src/buildstream/element.py
@@ -824,7 +824,7 @@
         """ Configure command batching across prepare() and assemble()
 
         Args:
-           flags: The sandbox flags for the command batch
+           flags: The :class:`.SandboxFlags` for the command batch
            collect: An optional directory containing partial install contents
                     on command failure.