fix-6.0-schema-validation-error (#12375)

Author: amalhotra-mdb

content/manual/v6.0/source/core/schema-validation/specify-validation-polymorphic-collections.txt

@@ -17,8 +17,8 @@ Specify Validation for Polymorphic Collections
    :depth: 2
    :class: singlecol
 
-You can specify schema validation for a collection that stores :ref:`polymorphic 
-data<polymorphic-data>`, or documents with varying structures or schemas. 
+You can specify schema validation for a collection that stores polymorphic 
+data, or documents with varying structures or schemas. 
 
 To create schema validation for multiple schemas within a single collection, 
 you can set the schemas in your validation rules and ensure that