Remove zuul:configobject

This isn't currently being used any differently than zuul:attr
so just switch to that.

Change-Id: I5d78f86874f7da6b1f556d38825a97668a2907c2
diff --git a/doc/source/admin/drivers/gerrit.rst b/doc/source/admin/drivers/gerrit.rst
index 296e47f..91a3510 100644
--- a/doc/source/admin/drivers/gerrit.rst
+++ b/doc/source/admin/drivers/gerrit.rst
@@ -192,7 +192,7 @@
 named *my-gerrit* must have a Code Review vote of +2 in order to be
 enqueued into the pipeline.
 
-.. zuul:configobject:: pipeline.require.<source>
+.. zuul:attr:: pipeline.require.<source>
 
    The dictionary passed to the Gerrit pipeline `require` attribute
    supports the following attributes:
@@ -250,7 +250,7 @@
       A string value that corresponds with the status of the change
       reported by the trigger.
 
-.. zuul:configobject:: pipeline.reject.<source>
+.. zuul:attr:: pipeline.reject.<source>
 
    The `reject` attribute is the mirror of the `require` attribute.  It
    also accepts a dictionary under the connection name.  This