GS6003 - Sryles and Templates -- Repository in Templates dialog

Hi all,

The section "Adding templates obtained from other sources" of "GS6003
- Sryles and Templates" chapter has mention about Repository:
"If you have enabled experimental features in Tools > Options >
LibreOffice > Advanced, the Templates dialog shows a Repository button
that you can use to add other template repositories. As this is an
experimental feature, it may not work reliably."
Now this button is not available, no matter experimental features is
enabled or not.
We should remove the mention of not confusing the beginner.

Best regards,
Lera