Mention more per-host specification methods

[積丹尼 Dan Jacobson]

On (info "(tramp) Android shell setup") there is mentioned e.g.,
          (add-to-list 'tramp-remote-path 'tramp-own-remote-path)
          (add-to-list 'tramp-remote-path "/system/xbin")
          (add-to-list 'tramp-remote-process-environment "TMPDIR=$HOME")
          (add-to-list 'tramp-connection-properties
                     (list (regexp-quote "android") "remote-shell" "sh"))

OK, the first three don't mention how to do it "per host". Only the last
one shows how to do it "per host (android)". Perhaps the rest should
too. And also show a wildcard example matching all hosts.