docs: sphinx/kernel_abi: properly split lines

Sphinx doesn't like to have lines split with str.split("\n").

Instead, it uses its own splitter, with handles line breaks the way
Spinx expects. Not using it cause issues at the output files.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/d4ad5b977799616544376210364d5cec686119ef.1739182025.git.mchehab+huawei@kernel.org

Documentation/sphinx/kernel_abi.py

@@ -36,7 +36,7 @@ import os
 import re
 import sys
 
-from docutils import nodes
+from docutils import nodes, statemachine
 from docutils.statemachine import ViewList
 from docutils.parsers.rst import directives, Directive
 from sphinx.util.docutils import switch_source_input
@@ -105,7 +105,8 @@ class KernelCmd(Directive):
             old_f = fname
             n = 0
             for msg, f, ln in self.parser.doc():
-                msg_list = msg.split("\n")
+                msg_list = statemachine.string2lines(msg, tab_width,
+                                                     convert_whitespace=True)
                 if "debug" in self.options:
                     lines = [
                         "", "",  ".. code-block:: rst",