drm/atomic-helper: fix kernel-doc problems

Fix a kernel-doc warning and other kernel-doc formatting for
drm_atomic_helper_connect_tv_check().

drivers/gpu/drm/drm_atomic_state_helper.c:560: warning: Cannot understand * @drm_atomic_helper_connector_tv_check: Validate an analog TV connector state
on line 560 - I thought it was a doc line

Fixes: 5a28cefda3a9 ("drm/atomic-helper: Add an analog TV atomic_check implementation")
Signed-off-by: Randy Dunlap <[e-mail]>
Cc: Maxime Ripard <[e-mail]>
Cc: Maarten Lankhorst <[e-mail]>
CC: Thomas Zimmermann <[e-mail]>
Cc: David Airlie <[e-mail]>
Cc: Daniel Vetter <[e-mail]>
Cc: [e-mail]
Signed-off-by: Maxime Ripard <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/drm_atomic_state_helper.c

···
 EXPORT_SYMBOL(drm_atomic_helper_connector_tv_reset);
 
 /**
- * @drm_atomic_helper_connector_tv_check: Validate an analog TV connector state
+ * drm_atomic_helper_connector_tv_check - Validate an analog TV connector state
  * @connector: DRM Connector
  * @state: the DRM State object
  *
  * Checks the state object to see if the requested state is valid for an
  * analog TV connector.
  *
- * Returns:
- * Zero for success, a negative error code on error.
+ * Return:
+ * %0 for success, a negative error code on error.
  */
 int drm_atomic_helper_connector_tv_check(struct drm_connector *connector,
 					 struct drm_atomic_state *state)