Add docs for StaticContentWidget

docs/admin/50_dashboard.rst

@@ -18,6 +18,14 @@ optionally with an icon or picture next to it. It therefore provides the followi
 
 As link title, the widget title will be used.
 
+Static content widget
+^^^^^^^^^^^^^^^^^^^^
+
+The static content widget allows to display custom static information on the dashboard,
+It therefore provides the following additional attribute:
+
+* **Content**: The content of the widget. HTML can be used for formatting.
+
 More dashboard widgets from apps
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