Fix grammar in E0283 explanation

[vors]

Author probably meant not "Maybe anything else?", but "Maybe something else?"

[rust-highfive]

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[cramertj]

@bors r+ rollup

[bors]

📌 Commit e8d0281 has been approved by cramertj

[bors]

⌛ Testing commit e8d0281 with merge 1aa2506...

[bors]

☀️ Test successful - checks-travis, status-appveyor
Approved by: cramertj
Pushing 1aa2506 to master...