docs: fix broken reference to backup_remote

while restructuring the docs, explicit title wasn't included in the
correct file

fixes commit 04e24b14f0

Signed-off-by: Oguz Bektas <o.bektas@proxmox.com>

docs/managing-remotes.rst

@@ -1,6 +1,8 @@
 Managing Remotes
 ================
 
+.. _backup_remote:
+
 :term:`Remote`
 --------------
 

docs/network-management.rst

@@ -86,6 +86,3 @@ You can also configure DNS settings, from the **DNS** section
 of **Configuration** or by using the ``dns`` subcommand of
 ``proxmox-backup-manager``.
 
-.. _backup_remote:
-
-

www/OnlineHelpInfo.js

@@ -11,6 +11,10 @@ const proxmoxOnlineHelpInfo = {
     "link": "/docs/sysadmin.html#chapter-zfs",
     "title": "ZFS on Linux"
   },
+  "backup-remote": {
+    "link": "/docs/managing-remotes.html#backup-remote",
+    "title": ":term:`Remote`"
+  },
   "syncjobs": {
     "link": "/docs/managing-remotes.html#syncjobs",
     "title": "Sync Jobs"