ftrace: Add missing kerneldoc parameters to unregister_ftrace_direct()

Add the description to the parameters addr and free_filters
of the function unregister_ftrace_direct().

Link: https://lore.kernel.org/linux-trace-kernel/20240606132520.1397567-1-marilene.agarcia@gmail.com

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Signed-off-by: Marilene A Garcia <marilene.agarcia@gmail.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

kernel/trace/ftrace.c

@@ -5988,6 +5988,8 @@ EXPORT_SYMBOL_GPL(register_ftrace_direct);
  * unregister_ftrace_direct - Remove calls to custom trampoline
  * previously registered by register_ftrace_direct for @ops object.
  * @ops: The address of the struct ftrace_ops object
+ * @addr: The address of the direct function that is called by the @ops functions
+ * @free_filters: Set to true to remove all filters for the ftrace_ops, false otherwise
  *
  * This is used to remove a direct calls to @addr from the nop locations
  * of the functions registered in @ops (with by ftrace_set_filter_ip