microblaze: Fix some typos in comment

Replace 'the the' with 'like the' in the comment.
Replace 'an' with 'a'.
Signed-off-by: Slark Xiao <slark_xiao@163.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/20220721071520.48384-1-slark_xiao@163.com

arch/microblaze/kernel/entry.S

@@ -456,7 +456,7 @@ TRAP_return:		/* Make global symbol for debugging */
 
 
 /* This the initial entry point for a new child thread, with an appropriate
-   stack in place that makes it look the the child is in the middle of an
+   stack in place that makes it look like the child is in the middle of a
    syscall.  This function is actually `returned to' from switch_thread
    (copy_thread makes ret_from_fork the return address in each new thread's
    saved context).  */