platform/surface: aggregator: fix a kernel-doc markup

A function has a different name between their prototype
and its kernel-doc markup:

	../drivers/platform/surface/aggregator/ssh_request_layer.c:1065: warning: expecting prototype for ssh_rtl_tx_start(). Prototype was for ssh_rtl_start() instead
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com>
Link: https://lore.kernel.org/r/4a6bf33cfbd06654d78294127f2b6d354d073089.1610610937.git.mchehab+huawei@kernel.orgSigned-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/surface/aggregator/ssh_request_layer.c

@@ -1056,7 +1056,7 @@ void ssh_rtl_destroy(struct ssh_rtl *rtl)
 }
 
 /**
- * ssh_rtl_tx_start() - Start request transmitter and receiver.
+ * ssh_rtl_start() - Start request transmitter and receiver.
  * @rtl: The request transport layer.
  *
  * Return: Returns zero on success, a negative error code on failure.