Documentation/sphinx: rename kernel-doc.py to kerneldoc.py

Python module names should not have hyphens per [PEP 8]. Drop the hyphen
from kernel-doc.py. The extension directive remains unchanged.

[PEP 8] https://www.python.org/dev/peps/pep-0008/#package-and-module-names

Reported-by: Markus Heiser <markus.heiser@darmarit.de>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/conf.py b/Documentation/conf.py
index bf6f310..4db1993 100644
--- a/Documentation/conf.py
+++ b/Documentation/conf.py
@@ -34,7 +34,7 @@
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
-extensions = ['kernel-doc', 'rstFlatTable', 'kernel_include', 'cdomain']
+extensions = ['kerneldoc', 'rstFlatTable', 'kernel_include', 'cdomain']
 
 # The name of the math extension changed on Sphinx 1.4
 if minor > 3:
diff --git a/Documentation/sphinx/kernel-doc.py b/Documentation/sphinx/kerneldoc.py
similarity index 100%
rename from Documentation/sphinx/kernel-doc.py
rename to Documentation/sphinx/kerneldoc.py