Update hw2-elf.html (Typo fixing, grammar rule)
Fixed the following:
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typo1: "EFL files” -> “ELF files”
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typo2: "I this” -> “In this”
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typo3: “does need” -> “does not need”
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typo4: “STH and PTH” -> “SHT and PHT”
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typo5:“shoudl” -> “should”
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typo6: withing -> within
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grammar1: comma after introductory clause “While ... intimidating in practice” -> "While ... intimidating, in practice”
Edited by Max Villa