[ptxdist] [PATCH] doc: once again mention cmake support for configure_helper.py

[Markus Heidelberg via ptxdist <ptxdist@pengutronix.de>]

Another similar place in this documentation file had already been fixed
in commit d492fcbcfd ("doc: contributing: mention configure_helper.py
support for cmake", 2019-09-09).

Signed-off-by: Markus Heidelberg <m.heidelberg@cab.de>
---
 doc/contributing.rst | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/doc/contributing.rst b/doc/contributing.rst
index 63da67802..4130427b5 100644
--- a/doc/contributing.rst
+++ b/doc/contributing.rst
@@ -177,8 +177,8 @@ configure_helper.py
 
 ``configure_helper.py`` can be found in ``scripts/`` in the PTXdist source
 tree. It should be used to determine which build system options should be
-specified for a package. Currently, only **autoconf** and **meson** based
-packages are supported.
+specified for a package. Currently, only **autoconf**, **meson** and
+**cmake** based packages are supported.
 
 It provides a diff between two lists of options. These list are generated
 from the options specified in the package Makefile and from the source tree
-- 
2.43.0