API Reference: Added missing autodoc pages

docs/internals/reference/index.rst

@@ -43,6 +43,7 @@
     celery.utils.compat
     celery.utils.mail
     celery.utils.patch
+    celery.utils.functional
     celery.utils.dispatch
     celery.utils.dispatch.signal
     celery.utils.dispatch.saferef

docs/reference/celery.task.sets.rst

@@ -0,0 +1,11 @@
+======================================================
+ Task Sets, Subtasks and Callbacks - celery.task.sets
+======================================================
+
+.. contents::
+    :local:
+.. currentmodule:: celery.task.sets
+
+.. automodule:: celery.task.sets
+    :members:
+    :undoc-members:

docs/reference/index.rst

@@ -10,6 +10,7 @@
 
     celery.decorators
     celery.task.base
+    celery.task.sets
     celery.execute
     celery.result
     celery.task