IGNITE-23221 Update a message about java version and jvm startup params

[JAkutenshi]

JIRA Ticket: IGNITE-23221

The goal

The main goal is to remove obsolete links on Apache Ignite documentation website.

The reason

We should use proper up-to-date documentation warning messages for our users.

The solution

The only place that contains a link with the noticed prefix https://apacheignite.readme.io/ is JAVA_VER_WARN variable that is used for user's notification about Java version specific startup parameters. But for now we're supporting only Java 11+, so at most the message is obsolete and we should to inform a user about proper JVM's startup parameters with a link on a proper documentation about Ignite startup but 3.0.0-beta version until release: https://ignite.apache.org/docs/3.0.0-beta/quick-start/getting-started-guide

Also the constant itself was renamed accordingly.

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Notes

• Apache Ignite Coding Guidelines