Add missing dcstrings in Tramp, remove chec for obsolee methods

Add missing dcstrings in Tramp, remove chec for obsolee methods

* lisp/net/tramp.el (tramp-progress-reporter-update)
(tramp-unload-file-name-handlers, tramp-get-local-uid)
(tramp-get-local-gid, tramp-get-local-locale):
* lisp/net/tramp-adb.el (tramp-adb-ls-date-regexp)
(tramp-adb-ls-toolbox-regexp, tramp-adb-get-ls-command):
* lisp/net/tramp-compat.el (tramp-compat-funcall):
* lisp/net/tramp-ftp.el (tramp-ftp-enable-ange-ftp):
* lisp/net/tramp-gw.el (tramp-gw-process-filter):
* lisp/net/tramp-sh.el (tramp-get-remote-path)
(tramp-get-remote-locale, tramp-get-ls-command)
(tramp-get-ls-command-with-dired)
(tramp-get-ls-command-with-quoting-style)
(tramp-get-ls-command-with-w-option)
(tramp-get-test-nt-command, tramp-get-file-exists-command)
(tramp-get-remote-ln, tramp-get-remote-perl)
(tramp-get-remote-stat, tramp-get-remote-readlink)
(tramp-get-remote-trash, tramp-get-remote-touch)
(tramp-get-remote-gvfs-monitor-dir)
(tramp-get-remote-inotifywait, tramp-get-remote-id)
(tramp-get-remote-uid-with-id)
(tramp-get-remote-uid-with-perl, tramp-get-remote-python)
(tramp-get-remote-uid-with-python, tramp-get-remote-uid)
(tramp-get-remote-gid-with-id)
(tramp-get-remote-gid-with-perl)
(tramp-get-remote-gid-with-python, tramp-get-remote-gid)
(tramp-get-env-with-u-option): Add missing docstrings.

* lisp/net/tramp.el (tramp-obsolete-methods)
(tramp-warned-obsolete-methods): Remove.
(tramp-find-method): Do not check for obsolete methods any longer.