fix(Groupware): fix double space typo in contacts user manual version tag

Agent-Logs-Url: https://github.com/nextcloud/documentation/sessions/2ec2bc40-5378-4758-b34e-116513e795c2

Co-authored-by: skjnldsv <14975046+skjnldsv@users.noreply.github.com>

Author: Copilot

user_manual/groupware/contacts.rst

@@ -246,7 +246,7 @@ When this option is enabled, the team can no longer be directly added as a membe
 
 Shared items
 ~~~~~~~~~~~~
-.. versionadded:: 5.5 Nextcloud  25 or newer
+.. versionadded:: 5.5 Nextcloud 25 or newer
 
 .. figure:: ./images/shared-items.png