update misspelling on index.en-US.md (#12280)

On the line 158, the words "can not" are likely in a wrong construction for this sentence. It would be better to use "cannot" in this context.
pull/12290/head
Phanupong Janthapoon 6 years ago committed by 偏右
parent e58273dccf
commit 0e29194668
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