[add] links to new diagram editor snippets to what's new for v6.1

Author: mafanya23

docs/whats_new.md

@@ -61,11 +61,11 @@ Released on November , 2025
 - [Diagram. PERT chart. Filter/search tasks](https://snippet.dhtmlx.com/1b2bmmxk)
 - [Diagram. PERT chart. Custom sidebar for task information](https://snippet.dhtmlx.com/712lsox0)
 - [Diagram. PERT chart. Themes](https://snippet.dhtmlx.com/2e5y5u6m)
-- Diagram Editor. Managing shapes moving, rotating and resizing via events
-- Diagram Editor. Managing hotkeys adding, modifying and disabling via the API
-- Diagram. Fishbone Diagram. Causes and solutions
-- Diagram. Fishbone Diagram. Multiple causes
-- [Diagram. Export. Bottom left watermark](https://snippet.dhtmlx.com/d56spdsc)
+- [Diagram Editor. Managing shapes moving, rotating and resizing via events](https://snippet.dhtmlx.com/qldjbbm7)
+- [Diagram Editor. Managing hotkeys adding, modifying and disabling via API](https://snippet.dhtmlx.com/8ads5dq8)
+- [Diagram Editor. Fishbone Diagram. Causes and solutions](https://snippet.dhtmlx.com/7vhwtiba)
+- [Diagram Editor. Fishbone Diagram. Multiple causes](https://snippet.dhtmlx.com/0dgjwt6u)
+- [Diagram. Export. Bottom-left watermark](https://snippet.dhtmlx.com/d56spdsc)
 - [Diagram. Export. Repeating watermark](https://snippet.dhtmlx.com/emkea55j)
 
 ## Version 6.0.11