Update startup banner for the new website

Plus add a new link, to the Upgrading guide,
arguably one of the more important guides we have
today.

(cherry picked from commit 478419e)

Author: michaelklishin

deps/rabbit/src/rabbit.erl

@@ -1289,10 +1289,11 @@ print_banner() ->
               "~n  TLS Library: ~ts"
               "~n  Release series support status: ~ts"
               "~n"
-              "~n  Doc guides:  https://www.rabbitmq.com/docs/documentation"
+              "~n  Doc guides:  https://www.rabbitmq.com/docs"
               "~n  Support:     https://www.rabbitmq.com/docs/contact"
               "~n  Tutorials:   https://www.rabbitmq.com/tutorials"
               "~n  Monitoring:  https://www.rabbitmq.com/docs/monitoring"
+              "~n  Upgrading:   https://www.rabbitmq.com/docs/upgrade"
               "~n"
               "~n  Logs: ~ts" ++ LogFmt ++ "~n"
               "~n  Config file(s): ~ts" ++ CfgFmt ++ "~n"
@@ -1310,7 +1311,7 @@ maybe_warn_about_release_series_eol() ->
             %% we intentionally log this as an error for increased visibiity
             ?LOG_ERROR("This release series has reached end of life "
                        "and is no longer supported. "
-                       "Please visit https://rabbitmq.com/versions.html "
+                       "Please visit https://www.rabbitmq.com/release-information "
                        "to learn more and upgrade");
         _ -> ok
     end.