docs: update to next version [BUMP BETA] (#4493)

platform/docs/versioned_docs/version-3.9/configuration/dataSources/introduction.md

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+---
+sidebar_position: 1
+sidebar_label: Introduction
+---
+
+# Data Source
+
+The internal data structure of OHIF’s metadata follows naturalized DICOM JSON, a
+format pioneered by `dcmjs`. In short DICOM metadata headers with DICOM Keywords
+instead of tags and sequences as arrays, for easy development and clear code.
+
+Here in this section we will discuss couple of data sources that are commonly used
+and OHIF has provided the implementation for them.
+
+## Custom Data Source
+Do you have a custom data source? or a custom data that you want to use in OHIF?
+You can easily write a data source to map your data to OHIF’s native format.
+
+You can read more in the [Data Source Module](../../platform/extensions/modules/data-source.md)