bootstage: Fix typos in the comment

There are two typos in the comment block in bootstage.h, fix them.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>

include/bootstage.h

@@ -86,9 +86,9 @@ enum bootstage_id {
 	BOOTSTAGE_ID_POST_FAIL_R,	/* Post failure reported after reloc */
 
 	/*
-	 * This set is reported ony by x86, and the meaning is different. In
+	 * This set is reported only by x86, and the meaning is different. In
 	 * this case we are reporting completion of a particular stage.
-	 * This should probably change in he x86 code (which doesn't report
+	 * This should probably change in the x86 code (which doesn't report
 	 * errors in any case), but discussion this can perhaps wait until we
 	 * have a generic board implementation.
 	 */