[PATCH 1/3] docs: kdoc: Fix pdfdocs build for tools

[Mauro Carvalho Chehab <mchehab+huawei@kernel.org>]

the "\1" inside a docstring requires proper scaping to not be
considered a hex character and break the build.

Reported-by: Akira Yokosawa <akiyks@gmail.com>
Closes: https://lore.kernel.org/linux-doc/63e99049-cc72-4156-83af-414fdde34312@gmail.com/
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 tools/lib/python/kdoc/kdoc_re.py | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/tools/lib/python/kdoc/kdoc_re.py b/tools/lib/python/kdoc/kdoc_re.py
index 2816bd9f90f8..0bf9e01cdc57 100644
--- a/tools/lib/python/kdoc/kdoc_re.py
+++ b/tools/lib/python/kdoc/kdoc_re.py
@@ -228,14 +228,18 @@ class NestedMatch:
             yield line[t[0]:t[2]]
 
     def sub(self, regex, sub, line, count=0):
-        """
+        r"""
         This is similar to re.sub:
 
         It matches a regex that it is followed by a delimiter,
         replacing occurrences only if all delimiters are paired.
 
-        if r'\1' is used, it works just like re: it places there the
-        matched paired data with the delimiter stripped.
+        if the sub argument contains::
+
+            r'\1'
+
+        it will work just like re: it places there the matched paired data
+        with the delimiter stripped.
 
         If count is different than zero, it will replace at most count
         items.
-- 
2.52.0