[PATCH] doc/guides: fix typo for cnxk platform

[Thierry Herbelot]

The Linux kernel option has an added underscore.

Fixes: 14ad4f01845331a ('doc: add Marvell OCTEON TX2 platform guide')
Signed-off-by: Thierry Herbelot <thierry.herbelot at 6wind.com>
---
 doc/guides/platform/cnxk.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/guides/platform/cnxk.rst b/doc/guides/platform/cnxk.rst
index 4a1966c66bae..b3aa4de09d0a 100644
--- a/doc/guides/platform/cnxk.rst
+++ b/doc/guides/platform/cnxk.rst
@@ -258,7 +258,7 @@ context or stats using debugfs.
 
 Enable ``debugfs`` by:
 
-1. Compile kernel with debugfs enabled, i.e ``CONFIG_DEBUGFS=y``.
+1. Compile kernel with debugfs enabled, i.e ``CONFIG_DEBUG_FS=y``.
 2. Boot OCTEON CN9K/CN10K with debugfs supported kernel.
 3. Verify ``debugfs`` mounted by default "mount | grep -i debugfs" or mount it manually by using.
 
-- 
2.39.2