Merge pull request magento#6994 from androshchuk/patch-1

Update custom-import-entity.md

Author: dobooth

src/guides/v2.3/ext-best-practices/tutorials/custom-import-entity.md

@@ -445,7 +445,7 @@ Next, register the sample file for our entity.
 
 ```xml
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-        xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_ImportExport:etc/import.xsd">
+        xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
     <type name="Magento\ImportExport\Model\Import\SampleFileProvider">
         <arguments>
             <argument name="samples" xsi:type="array">