Add docs for creating a new part via form

docs/releases/0.4.6.md

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+---
+title: Release 0.4.6
+---
+
+## Release 0.4.6
+
+### Form Groups
+
+[#1956](https://github.com/inventree/InvenTree/pull/1956) adds collapsible groups to modal forms, which allows rendering of complex forms with dynamic control of grouped items. As part of this pull request, manufacturer and supplier details can now be added when creating a new part.
+
+### Bug Fixes
+
+| Pull Request | Description |
+| --- | --- |
+| [#1952](https://github.com/inventree/InvenTree/pull/1952) | Fixes bug in dockerfile which pointed to incorrect github branch on tagged release |