[Connection Settings] Update the H1 to “Connection” to reflect the change in tab name
The current build still says "Tor Settings":
However we should update the H1 to read "Connection" to complete the renaming proposed in #40568 (closed) and match the designs in #40782 (closed).
On a related note: should we update the URI to about:preferences#connection
too? Or are we afraid that will break a lot of things?