java/openjdk*: Update pkg-message information about fdescfs and procfs

OpenJDK installation inform that fdescfs(5) and procfs(5) should be
mounted when using OpenJDK.
After doing some test and some traces, it seems that this should be
no so usefull, some applications will require it, but most of java
applications doesn't seems to suffer to work or performance when
such pseudo FS is not mounted.

So this change request permit to let local administrator to decide if
it is really needed or not.

Sponsored by: Entersekt (previously Modirum MDpay)
Sponsored by: Klara Inc.
Approved by: 0mp (mentor)
PR: 283364