docs(examples): correct replaceOne usage

Use the correct parameters to the replaceOne example usage

NODE-2502

Author: nbbeeken

test/examples/update_documents.js

@@ -154,19 +154,11 @@ describe('examples(update-documents):', function() {
       await db.collection('inventory').replaceOne(
         { item: 'paper' },
         {
-          $set: {
-            item: 'paper',
-            instock: [
-              { warehouse: 'A', qty: 60 },
-              { warehouse: 'B', qty: 40 }
-            ]
-          },
-          $unset: {
-            qty: '',
-            size: '',
-            status: '',
-            lastModified: ''
-          }
+          item: 'paper',
+          instock: [
+            { warehouse: 'A', qty: 60 },
+            { warehouse: 'B', qty: 40 }
+          ]
         }
       );
       // End Example 54

test/functional/document_validation.test.js

@@ -124,7 +124,7 @@ describe('Document Validation', function() {
                             // updateMany
                             col.replaceOne(
                               { e: 1 },
-                              { $set: { e: 1 } },
+                              { e: 1 },
                               { upsert: true, bypassDocumentValidation: true },
                               function(err) {
                                 test.equal(null, err);