Add docUrl into metadata.

components/device-mgt/io.entgra.device.mgt.core.device.mgt.core/src/main/java/io/entgra/device/mgt/core/device/mgt/core/metadata/mgt/WhiteLabelManagementServiceImpl.java

@@ -65,6 +65,13 @@ public class WhiteLabelManagementServiceImpl implements WhiteLabelManagementServ
         initializeWhiteLabelThemes();
     }
 
+    /**
+     * Initializes white label themes for a tenant by retrieving white label metadata and updating it if necessary.
+     * If the white label metadata is found and the "DocUrl" is missing,it updates the metadata with the default value
+     * for DocUrl.
+     *
+     * @throws MetadataManagementException if an error occurs while managing metadata or transactions.
+     */
     private void initializeWhiteLabelThemes() throws MetadataManagementException {
         int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId(true);
         WhiteLabelTheme defaultTheme = getDefaultWhiteLabelTheme();
@@ -83,8 +90,7 @@ public class WhiteLabelManagementServiceImpl implements WhiteLabelManagementServ
                         log.debug("WhiteLabel theme's DocUrl was missing and has been updated to the default value " +
                                 "for tenant: " + tenantId);
                     }
-                }
-                catch (MetadataManagementDAOException e) {
+                } catch (MetadataManagementDAOException e) {
                     MetadataManagementDAOFactory.rollbackTransaction();
                     String msg = "Error occurred while fetching white label metadata for tenant: " + tenantId;
                     log.error(msg, e);
@@ -167,7 +173,7 @@ public class WhiteLabelManagementServiceImpl implements WhiteLabelManagementServ
      */
     private FileResponse getImageFileResponseFromUrl(String url) throws IOException, NotFoundException {
         FileResponse fileResponse = new FileResponse();
-        try(CloseableHttpClient client = HttpClients.createDefault()) {
+        try (CloseableHttpClient client = HttpClients.createDefault()) {
             HttpGet imageGetRequest = new HttpGet(url);
             HttpResponse response = client.execute(imageGetRequest);
             InputStream imageStream = response.getEntity().getContent();
@@ -528,12 +534,13 @@ public class WhiteLabelManagementServiceImpl implements WhiteLabelManagementServ
 
     /**
      * Load White label Meta Data for given tenant Id.
+     *
      * @param tenantId Id of the tenant
      * @return {@link Metadata}
      * @throws MetadataManagementException if an error occurred while getting Meta-Data info from Database for a
      *                                     given tenant ID.
      */
-    private Metadata getWhiteLabelMetaData (int tenantId) throws MetadataManagementException {
+    private Metadata getWhiteLabelMetaData(int tenantId) throws MetadataManagementException {
         try {
             MetadataManagementDAOFactory.openConnection();
             return metadataDAO.getMetadata(tenantId, MetadataConstants.WHITELABEL_META_KEY);