add more comments in toy.S
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				@ -26,5 +26,5 @@ dispstr:
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	int $0x10                                              /* 调用BIOS提供的int服务0x10的0x13功能:显示字符串 */ 
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	ret
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.org    0x1fe, 0x90 
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.word 0xaa55 
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.org    0x1fe, 0x90                                       /* 0x1fe=510,表示从ret后的位置开始,直到510处结束的代码/数据空间,填写0x90 */
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.word 0xaa55                                              /* 合法的主引导扇区标识 */
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