website: user-info add TUI section

Author: ilg-ul

website/docs/user-info/_more.mdx

@@ -146,6 +146,17 @@ possible combinations are actually available.
 
 Please check the release for the actual list.
 
+## Text User Interface (TUI)
+
+Support for TUI was added to GDB. The `ncurses` library was added to
+the distribution.
+
+:::note
+
+TUI is not available on Windows
+
+:::
+
 ## Python
 
 Support for Python scripting was added to GDB. This distribution provides