RFR 9: 8153882 rmid emits warning about security policy with obsolete URL

[Roger Riggs]

Please review a change to an warning message from rmid when the security 
policy is incorrectly configured.
There is no reliable link to the rmid documentation that will remain 
accurate across JDK versions.
The direct link is removed and expect the user to find the rmid 
documentation from the doc bundle or
via a web search.

(this corrects the US english version, other locale will require 
translation)

Webrev:
    http://cr.openjdk.java.net/~rriggs/webrev-rmid-url-8153882/

Issue:
    https://bugs.openjdk.java.net/browse/JDK-8153882

Thanks, Roger