Re-document EagerDGDiscretization to avoid breaking mirgecom doc build

doc/discretization.rst

@@ -4,9 +4,3 @@ Discretization
 .. module:: grudge
 
 .. automodule:: grudge.discretization
-
-Discretization with Eager Evaluation
-====================================
-
-.. automodule:: grudge.eager
-

doc/misc.rst

@@ -139,3 +139,7 @@ AK also gratefully acknowledges a hardware gift from Nvidia Corporation.
 The views and opinions expressed herein do not necessarily reflect those of the
 funding agencies.
 
+Deprecated functionality
+========================
+
+.. automodule:: grudge.eager

grudge/eager.py

+"""
+.. autoclass:: EagerDGDiscretization
+"""
 __copyright__ = "Copyright (C) 2020 Andreas Kloeckner"
 
 __license__ = """
@@ -26,9 +29,10 @@ from grudge.discretization import DiscretizationCollection
 
 class EagerDGDiscretization(DiscretizationCollection):
     """
-    Inherits from :class:`~grudge.discretization.DiscretizationCollection`.
-
-    .. automethod:: __init__
+    This class is deprecated and only part of the documentation in order to
+    avoid breaking depending documentation builds.
+    Use :class:`~grudge.discretization.DiscretizationCollection` instead in
+    new code.
     """
 
     def __init__(self, *args, **kwargs):