Replace it with olddefconfig. oldnoconfig didn't do what the document
suggests (it aliased to olddefconfig), and isn't available since 4.19.

Ref: 04c459d20448 ("kconfig: remove oldnoconfig target")
Ref: 312ee68752fa ("kconfig: announce removal of oldnoconfig if used")
Signed-off-by: Ismael Luceno <ismael@iodev.co.uk>
---
 Documentation/admin-guide/reporting-issues.rst | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/Documentation/admin-guide/reporting-issues.rst b/Documentation/admin-guide/reporting-issues.rst
index 07879d01fe68..ffa0d4c6e450 100644
--- a/Documentation/admin-guide/reporting-issues.rst
+++ b/Documentation/admin-guide/reporting-issues.rst

@@ -1000,8 +1000,7 @@ In the whole process keep in mind: an issue only qualifies as regression if the
 older and the newer kernel got built with a similar configuration. The best way
 to archive this: copy the configuration file (``.config``) from the old working
 kernel freshly to each newer kernel version you try. Afterwards run ``make
-oldnoconfig`` to adjust it for the needs of the new version without enabling
-any new feature, as those are allowed to cause regressions.
+olddefconfig`` to adjust it for the needs of the new version.