Rename :filename: option of code-block directive to :caption:

tests/roots/test-directive-code/caption.rst

@@ -0,0 +1,21 @@
+Dedent
+======
+
+Code blocks
+-----------
+
+.. code-block:: ruby
+   :caption: caption-test.rb
+
+   def ruby?
+       false
+   end
+
+
+Literal Include
+---------------
+
+.. literalinclude:: literal.inc
+   :language: python
+   :caption: caption-test.py
+   :lines: 10-11

tests/roots/test-directive-code/index.rst

@@ -2,6 +2,7 @@ test-directive-code
 ===================
 
 .. toctree::
+   :glob:
 
    *