mention how to eliminate Checking vc-registered completely

[積丹尼 Dan Jacobson]

In (info "(tramp) Frequently Asked Questions"):

     Disable version control to avoid delays:

          (setq vc-ignore-dir-regexp
                (format "\\(%s\\)\\|\\(%s\\)"
                        vc-ignore-dir-regexp
                        tramp-file-name-regexp))

     If this is too radical, because you want to use version control
     remotely, trim ‘vc-handled-backends’ to just those you care about,
     for example:

          (setq vc-handled-backends '(SVN Git))


Also mention how to turn off version control completely,
so no
   Tramp: Checking ‘vc-registered’ for ...
message producing work is even attempted.