jme3-core: solve 10 javadoc diagnostics from JDK 11 #1646
Merged
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Most of the javadoc in the Engine was written for old JDKs, resulting in warnings and errors when it is built using newer ones. Some sub-projects (such as "jme3-lwjgl3" and "jme3-networking") work around this by disabling doclint for JDK8+. Others, including "jme3-core", don't disable doclint.
This PR solves the 3 warnings and 7 errors that JDK 11 currently reports for jme3-core.