doc: add some chapter labels
The idea is to make it easier to create references (doc-guide does the same).
This will be used, for example but not only, in translations to point to
the main document.
Signed-off-by: Federico Vaga <federico.vaga@vaga.pv.it>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/kernel-hacking/index.rst b/Documentation/kernel-hacking/index.rst
index fcb0eda..f530276 100644
--- a/Documentation/kernel-hacking/index.rst
+++ b/Documentation/kernel-hacking/index.rst
@@ -1,3 +1,5 @@
+.. _kernel_hacking:
+
=====================
Kernel Hacking Guides
=====================