Fix incorrect links under File Sharing on tools.md

* The Syncthing link was #syncthing instead of #syncthing-p2p
* The Nextcloud link was to productivity instead of file sharing

Signed-off-by: Daniel Gray <dngray@privacyguides.org>
Signed-off-by: mfwmyfacewhen <94880365+mfwmyfacewhen@users.noreply.github.com>

docs/tools.md

@@ -301,8 +301,8 @@ We [recommend](dns.md#recommended-providers) a number of encrypted DNS servers b
 - ![Send logo](assets/img/file-sharing-sync/send.svg){ .twemoji } [Send](file-sharing.md#send)
 - ![OnionShare logo](assets/img/file-sharing-sync/onionshare.svg){ .twemoji } [OnionShare](file-sharing.md#onionshare)
 - ![FreedomBox logo](assets/img/file-sharing-sync/freedombox.svg){ .twemoji } [FreedomBox](file-sharing.md#freedombox)
-- ![Nextcloud logo](assets/img/productivity/nextcloud.svg){ .twemoji } [Nextcloud (Self-Hostable)](productivity.md#nextcloud)
-- ![Syncthing logo](assets/img/file-sharing-sync/syncthing.svg){ .twemoji } [Syncthing](file-sharing.md#syncthing)
+- ![Nextcloud logo](assets/img/productivity/nextcloud.svg){ .twemoji } [Nextcloud (Self-Hostable)](file-sharing.md#nextcloud-client-server)
+- ![Syncthing logo](assets/img/file-sharing-sync/syncthing.svg){ .twemoji } [Syncthing](file-sharing.md#syncthing-p2p)
 
 </div>