Update SUMMARY.md

Author: madsrasmussen

17/umbraco-cms/SUMMARY.md

@@ -64,6 +64,7 @@
         * [Date Time (Unspecified)](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/date-time-editor/date-time-unspecified.md)
       * [Decimal](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/decimal.md)
       * [Email Address](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/email-address.md)
+      * [Entity Data Picker](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/entity-data-picker.md)
       * [Eye Dropper Color Picker](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/eye-dropper-color-picker.md)
       * [File Upload](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/file-upload.md)
       * [Image Cropper](fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/image-cropper.md)
@@ -227,6 +228,11 @@
   * [Property Editors Composition](customizing/property-editors/composition/README.md)
     * [Property Editor Schema](customizing/property-editors/composition/property-editor-schema.md)
     * [Property Editor UI](customizing/property-editors/composition/property-editor-ui.md)
+    * [Property Editor Data Source](customizing/property-editors/composition/property-editor-data-source.md)
+  * Property Editor Data Source Types
+    * [Picker](customizing/property-editors/data-source-types/picker/README.md)
+      * [Collection Data Source](customizing/property-editors/data-source-types/picker/picker-collection-data-source.md)
+      * [Tree Data Source](customizing/property-editors/data-source-types/picker/picker-tree-data-source.md)
   * [Property Value Converters](customizing/property-editors/property-value-converters.md)
   * [Property Value Converter Example](customizing/property-editors/full-examples-value-converters.md)
   * [Property Actions](customizing/property-editors/property-actions.md)