drm/display: fix kerneldocs references

The commit 9da7ec9b ("drm/bridge-connector: move to
DRM_DISPLAY_HELPER module") changed location of the
drm_bridge_connector.c file, but didn't update the kerneldocs. Fix that.

Fixes: 9da7ec9b ("drm/bridge-connector: move to DRM_DISPLAY_HELPER module")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Closes: https://lore.kernel.org/dri-devel/20240904163018.214efaa7@canb.auug.org.au/Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-By: Carlos Bilbao <carlos.bilbao.osdev@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240911-drm-fix-dbc-docs-v1-1-ae5cb82fce1e@linaro.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

Documentation/gpu/drm-kms-helpers.rst

@@ -181,7 +181,7 @@ Bridge Operations
 Bridge Connector Helper
 -----------------------
 
-.. kernel-doc:: drivers/gpu/drm/drm_bridge_connector.c
+.. kernel-doc:: drivers/gpu/drm/display/drm_bridge_connector.c
    :doc: overview
 
 
@@ -204,7 +204,7 @@ MIPI-DSI bridge operation
 Bridge Connector Helper Reference
 ---------------------------------
 
-.. kernel-doc:: drivers/gpu/drm/drm_bridge_connector.c
+.. kernel-doc:: drivers/gpu/drm/display/drm_bridge_connector.c
    :export:
 
 Panel-Bridge Helper Reference