Merge pull request #4173 from robstoll/patch-1

fix typo, as as

Author: Blaisorblade

docs/docs/reference/erased-terms.md

@@ -92,7 +92,7 @@ that will not be found.
 As the implicit evidences of `turnedOn` and `turnedOff` are not used in the bodies of those functions 
 we can mark them as `erased`. This will remove the evidence parameters at runtime, but we would still
 evaluate the `isOn` and `isOff` implicits that where found as arguments.
-As `isOn` and `isOff` are not used except as as `erased` arguments, we can mark them as `erased`, hence
+As `isOn` and `isOff` are not used except as `erased` arguments, we can mark them as `erased`, hence
 removing the evaluation of the `isOn` and `isOff` evidences.
 
 ```scala