MC-3032: Update Documentation

- add comment about parent policies and fix complex type docs

Author: krissyhiserote

app/code/Magento/PageBuilder/docs/content-type-configuration.md

@@ -232,6 +232,7 @@ Any modifications you might want to make to content type configuration forms use
 ### `parents` configuration reference
 
 The `parents` element specifies which content types can accept this type as a child.
+Parent policies will overwrite any child policies that are set.
 
 **Example:**
 ``` xml

app/code/Magento/PageBuilder/docs/how-to-add-new-content-type.md

@@ -264,10 +264,6 @@ Now, let's add content type that can contain other content types. Create configu
               icon="icon-vendorname-complex"
               sortOrder="35"
               translate="label">
-            <parents default_policy="deny">
-                <parent name="row" policy="allow"/>
-                <parent name="column" policy="allow"/>
-            </parents>
             <children default_policy="deny">
                 <child name="heading" policy="allow"/>
             </children>