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hello_world_len points to the special st_shndx == SHN_ABS == 0xF1FF.
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0xF1FF is chosen so as to not conflict with other sections.
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st_value == 0xD == 13 which is the value we have stored there on the assembly: the length of the string Hello World!.
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This means that relocation will not affect this value: it is a constant.
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This is small optimization that our assembler does for us and which has ELF support.
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If we had used the address of hello_world_len anywhere, the assembler would not have been able to mark it as SHN_ABS, and the linker would have extra relocation work on it later.
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