Add link to explanation when introducing a new operator

The logical implication operator is included in this section but never explained. It might stump new readers with a pretty uncommon operator, and it's never referenced explicitly.
2022-01-11 17:01:43 +01:00
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@@ -276,6 +276,7 @@ stdenv.mkDerivation {
  ...
 }
 ```
+("->" is a boolean operation known as [logical implication](https://en.wikipedia.org/wiki/Truth_table#Logical_implication))

 The points of interest are: