doc(querying) Add documentation for the $notIn query operator.

docs/docs/models-usage.md

@@ -174,6 +174,7 @@ Project.findAll({
       $between: [6, 10],     // BETWEEN 6 AND 10
       $notBetween: [11, 15], // NOT BETWEEN 11 AND 15
       $in: [1, 2],           // IN [1, 2]
+      $notIn: [1, 2],        // NOT IN [1, 2]
       $like: '%hat',         // LIKE '%hat'
       $notLike: '%hat'       // NOT LIKE '%hat'
       $iLike: '%hat'         // ILIKE '%hat' (case insensitive)

docs/docs/querying.md

@@ -53,6 +53,7 @@ $ne: 20,               // id != 20
 $between: [6, 10],     // BETWEEN 6 AND 10
 $notBetween: [11, 15], // NOT BETWEEN 11 AND 15
 $in: [1, 2],           // IN [1, 2]
+$notIn: [1, 2],        // NOT IN [1, 2]
 $like: '%hat',         // LIKE '%hat'
 $notLike: '%hat'       // NOT LIKE '%hat'
 $iLike: '%hat'         // ILIKE '%hat' (case insensitive)