[MPIR-481] clarify Java Version: build, target or release?

[jira-importer]

Hervé Boutemy opened MPIR-481 and commented

summary says "Java Version", which in this case means "Target/Release Java Version"
but it's written in a "Build" section, which may feel like "JDK used during build"

We should put the 2, as in MSHARED-1466 META-INF/MANIFEST.MF entries Build-Jdk-Spec vs Release-Jdk-Spec/Target-Jdk-Spec

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Affects: 3.8.0

Issue Links:

• MSHARED-1466 add default MANIFEST entry for release/target JDK