docs: add missing automodule directives

Author: ahal

docs/reference/source/taskgraph.transforms.rst

@@ -36,6 +36,14 @@ taskgraph.transforms.cached\_tasks module
    :undoc-members:
    :show-inheritance:
 
+taskgraph.transforms.chunking module
+------------------------------------
+
+.. automodule:: taskgraph.transforms.chunking
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
 taskgraph.transforms.code\_review module
 ----------------------------------------
 
@@ -60,6 +68,14 @@ taskgraph.transforms.fetch module
    :undoc-members:
    :show-inheritance:
 
+taskgraph.transforms.matrix module
+----------------------------------
+
+.. automodule:: taskgraph.transforms.matrix
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
 taskgraph.transforms.notify module
 ----------------------------------
 
@@ -76,6 +92,14 @@ taskgraph.transforms.task module
    :undoc-members:
    :show-inheritance:
 
+taskgraph.transforms.task_context module
+----------------------------------------
+
+.. automodule:: taskgraph.transforms.task_context
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
 Module contents
 ---------------