Escape sequences treated as regular characters

misspell isn't validating escape sequences and sometimes treating them as misspellings. eg

"iterated element passed\nto it."

Would return

warning: "nto" is a misspelling of "not" (misspell)

where "nto" is actually "\nto" (ie byte(13) + "to" rather than byte(110) + "to")

Please note, error message taken from https://goreportcard.com - issue raised gojp/goreportcard#294

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