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/github.rst b/doc/source/admin/drivers/github.rst
index 6619322..c884be2 100644
--- a/doc/source/admin/drivers/github.rst
+++ b/doc/source/admin/drivers/github.rst
@@ -216,7 +216,7 @@
 named *my-github* must have an approved code review in order to be
 enqueued into the pipeline.
 
-.. zuul:configobject:: pipeline.require.<source>
+.. zuul:attr:: pipeline.require.<source>
 
    The dictionary passed to the GitHub pipeline `require` attribute
    supports the following attributes:
@@ -290,7 +290,7 @@
       indicated label (or labels).
 
 
-.. 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