Capitalise the title of the GPIO documentation page to match other
subsystems.

Signed-off-by: Kent Gibson <warthog618@gmail.com>
---
 Documentation/admin-guide/gpio/index.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/admin-guide/gpio/index.rst b/Documentation/admin-guide/gpio/index.rst
index 3ac3aa15fa8b..3f6d5a76702b 100644
--- a/Documentation/admin-guide/gpio/index.rst
+++ b/Documentation/admin-guide/gpio/index.rst
@@ -1,7 +1,7 @@
 .. SPDX-License-Identifier: GPL-2.0
 
 ====
-gpio
+GPIO
 ====
 
 .. toctree::
-- 
2.39.2