(DOCSP-36260): Use isNumber in filter examples (#6217)

* (DOCSP-36260): Use isNumber in filter examples

* fix line highlights

Author: jeff-allen-mongo

source/reference/operator/aggregation/filter.txt

@@ -105,27 +105,21 @@ Behavior
             $filter: {
                input: [ 1, "a", 2, null, 3.1, NumberLong(4), "5" ],
                as: "num",
-               cond: { $and: [
-                  { $gte: [ "$$num", NumberLong("-9223372036854775807") ] }, 
-                  { $lte: [ "$$num", NumberLong("9223372036854775807") ] }
-                ] } 
+               cond: { $isNumber: "$$num" }
             }
           }
 
      - ``[ 1, 2, 3.1, NumberLong(4) ]``
 
    * - .. code-block:: javascript
           :copyable: false
-          :emphasize-lines: 9
+          :emphasize-lines: 6
 
           {
             $filter: {
                input: [ 1, "a", 2, null, 3.1, NumberLong(4), "5" ],
                as: "num",
-               cond: { $and:[
-                  { $gte: [ "$$num", NumberLong("-9223372036854775807") ] },
-                  { $lte: [ "$$num", NumberLong("9223372036854775807") ] }
-               ] },
+               cond: { $isNumber: "$$num" },
                limit: 2
             }
           }
@@ -134,17 +128,14 @@ Behavior
 
    * - .. code-block:: javascript
           :copyable: false
-          :emphasize-lines: 9
+          :emphasize-lines: 6
 
           {
             $filter: {
                input: [ 1, "a", 2, null, 3.1, NumberLong(4), "5" ],
                as: "num",
-               cond: { $and:[
-                  { $gte: [ "$$num", NumberLong("-9223372036854775807") ] },
-                  { $lte: [ "$$num", NumberLong("9223372036854775807") ] }
-               ] },
-               limit: { $add: [ 0, 1 ]}
+               cond: { $isNumber: "$$num" },
+               limit: { $add: [ 0, 1 ] }
             }
           }