[docs] update comment about pre-installed Java version for SWIG build

[StrikerRUS]

Zulu OpenJDK has been replaced with Eclipse Temurin on Azure Pipelines (and GitHub Actions) Windows images.

Refer to

• https://github.com/actions/virtual-environments/blob/main/images/win/Windows2016-Readme.md#java

• Update June 30th, 2021: Zulu for Azure will no longer receive updates or support starting January 1st, 2022. Azure services are transitioning to Microsoft Build of OpenJDK for JDK 11 and Eclipse Temurin for JDK 8.
  https://docs.microsoft.com/en-us/azure/developer/java/fundamentals/java-jdk-install

• https://devblogs.microsoft.com/java/end-of-updates-support-and-availability-of-zulu-for-azure/

• -- Found Java: C:/hostedtoolcache/windows/Java_Temurin-Hotspot_jdk/8.0.302-8/x64/bin/java.exe (found version "1.8.0_302")
  -- Found JNI: C:/hostedtoolcache/windows/Java_Temurin-Hotspot_jdk/8.0.302-8/x64/lib/jawt.lib
  https://dev.azure.com/lightgbm-ci/lightgbm-ci/_build/results?buildId=11269&view=logs&j=457fb6cd-b9a6-52d5-ab83-9fdcfc761c31&t=302dfe64-6e46-5035-7255-9ce91154684d&l=187

cc @imatiach-msft

[jameslamb]

Thanks very much for taking the time to come update this comment, and for sharing the links in the PR description explaining the change!

[github-actions]

This pull request has been automatically locked since there has not been any recent activity since it was closed. To start a new related discussion, open a new issue at https://github.com/microsoft/LightGBM/issues including a reference to this.