Add jdtls info for Java < 17

[codingluke]

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[ChristianChiarulli]

while this will work, using something like nvim jdtls and adding specific runtimes might server you better, example: https://github.com/ChristianChiarulli/lvim/blob/master/ftplugin/java.lua#L118

[codingluke]

@ChristianChiarulli isn't the problem that the latest jdtls is not working with Java 11 at all. So setting the runtime is not helping here? https://github.com/williamboman/mason.nvim/discussions/286, https://github.com/eclipse/eclipse.jdt.ls/issues/2117