Documentation/gpu: Fix Panthor documentation build warnings

Fix Panthor documentation build errors uncovered by the makedocs target
when building with extra warnings enabled.

Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com>
Fixes: 6a797bd ("drm/panthor: add sysfs knob for enabling job profiling")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241009214346.2308917-1-adrian.larumbe@collabora.com

Author: larunbe

Documentation/gpu/drivers.rst

@@ -22,6 +22,7 @@ GPU Driver Documentation
    afbc
    komeda-kms
    panfrost
+   panthor
    zynqmp
 
 .. only::  subproject and html

Documentation/gpu/drm-usage-stats.rst

@@ -191,4 +191,5 @@ Driver specific implementations
 
 * :ref:`i915-usage-stats`
 * :ref:`panfrost-usage-stats`
+* :ref:`panthor-usage-stats`
 * :ref:`xe-usage-stats`

Documentation/gpu/panthor.rst

@@ -4,7 +4,7 @@
  drm/Panthor CSF driver
 =========================
 
-.. _panfrost-usage-stats:
+.. _panthor-usage-stats:
 
 Panthor DRM client usage stats implementation
 ==============================================