[PATCH 2/2] docs: kbuild: document KBUILD_RPM_WITH_DEVEL

[Pratham Patel <prathampatel@thefossguy.com>]

KBUILD_RPM_WITH_DEVEL was added to toggle the `with_devel` RPM macro.
Add brief documentation on its usage.

Signed-off-by: Pratham Patel <prathampatel@thefossguy.com>
---
 Documentation/kbuild/kbuild.rst | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/kbuild/kbuild.rst b/Documentation/kbuild/kbuild.rst
index 9c8d1d046ea5..0b7ae268ac67 100644
--- a/Documentation/kbuild/kbuild.rst
+++ b/Documentation/kbuild/kbuild.rst
@@ -310,6 +310,12 @@ These two variables allow to override the user@host string displayed during
 boot and in /proc/version. The default value is the output of the commands
 whoami and host, respectively.
 
+KBUILD_RPM_WITH_DEVEL
+---------------------
+This variable dictates weather creating an RPM package also builds a `-devel`
+package or not. Set to 1 if you want a `-devel` package. The default value
+is 0.
+
 LLVM
 ----
 If this variable is set to 1, Kbuild will use Clang and LLVM utilities instead
-- 
2.42.0