Ubuntu repo in docs has typo that leads to error, preventing installation -- FIX INCLUDED

[insaner]

https://docs.nextcloud.com/server/latest/admin_manual/office/example-ubuntu.html#add-repository says to

Add repository:

sudo echo "deb https://www.collaboraoffice.com/repos/CollaboraOnline/CODE-ubuntu2004 ./" > /etc/apt/sources.list.d/collaboraonline.sources

but that format is incorrect for *.sources files (throwing the following error: "Malformed stanza 1 in source list"). It instead should be:

sudo echo "deb https://www.collaboraoffice.com/repos/CollaboraOnline/CODE-ubuntu2004 ./" > /etc/apt/sources.list.d/collaboraonline.list

note the collaboraonline.list