doc: kerneldoc.py: fix indentation

kerneldoc.py is mostly indented with 4 spaces (like PEP8 suggests);
replace the last remaining tabs for consistency.

No functional change.

Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20240215134828.1277109-6-vegard.nossum@oracle.com

Documentation/sphinx/kerneldoc.py

@@ -61,9 +61,9 @@ class KernelDocDirective(Directive):
         env = self.state.document.settings.env
         cmd = [env.config.kerneldoc_bin, '-rst', '-enable-lineno']
 
-	# Pass the version string to kernel-doc, as it needs to use a different
-	# dialect, depending what the C domain supports for each specific
-	# Sphinx versions
+        # Pass the version string to kernel-doc, as it needs to use a different
+        # dialect, depending what the C domain supports for each specific
+        # Sphinx versions
         cmd += ['-sphinx-version', sphinx.__version__]
 
         filename = env.config.kerneldoc_srctree + '/' + self.arguments[0]