drm/panel: Fix kernel-doc typo for `follower_lock`

In the kernel doc for the `follower_lock` member of `struct drm_panel`
there was a typo where it was called `followers_lock`. This resulted
in a warning when making "htmldocs":

./include/drm/drm_panel.h:270: warning:
Function parameter or member 'follower_lock' not described in 'drm_panel'

Fix the typo.

Fixes: de0874165b83 ("drm/panel: Add a way for other devices to follow panel state")
Reported-by: Stephen Rothwell <[e-mail]>
Closes: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Douglas Anderson <[e-mail]>
Reviewed-by: Neil Armstrong <[e-mail]>
Signed-off-by: Neil Armstrong <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/20230802074727.1.I4036706ad5e7f45e80d41b777164258e52079cd8@changeid

include/drm/drm_panel.h

···
 	struct list_head followers;
 
 	/**
-	 * @followers_lock:
+	 * @follower_lock:
 	 *
 	 * Lock for followers list.
 	 */