Documentation of JDK version is outdated

[mernst]

https://errorprone.info/docs/installation says, "Please note that Error Prone must be run on JDK 11 or newer." That should be updated to "JDK 17 or newer."

[gemmellr]

There are other fixups that could be made, e.g there are references to running on older JDKs like JDK 9 and JDK 16, seems like at least some of those could be cleaned up given ErrorProne 2.32.0 no longer runs on anything less than 17.

[cushon]

Thanks, I'll take a pass over the installation docs to update those references

[cushon]

I made an update in d09f60b, feel free to let me know if you see any other references to JDK 11 I missed