serial: core: Fix kernel doc for uart_console_write()

'/**' is required to start a kernel-doc comment block.
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/serial_core.c

@@ -1765,7 +1765,7 @@ static const struct file_operations uart_proc_fops = {
 #endif
 
 #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL)
-/*
+/**
  *	uart_console_write - write a console message to a serial port
  *	@port: the port to write the message
  *	@s: array of characters