[Misc] Fix javadoc to work with Java 11

...ation/reference/TypedStringEntityReferenceSerializer.java

...main/java/com/xpn/xwiki/plugin/autotag/FrenchStemmer.java

...e/src/main/java/org/xwiki/bridge/DocumentModelBridge.java

...main/java/org/xwiki/bridge/event/ActionExecutedEvent.java

...ain/java/org/xwiki/bridge/event/ActionExecutingEvent.java

...main/java/org/xwiki/eventstream/EventStreamException.java

...n/java/org/xwiki/extension/xar/XarExtensionException.java

...n/java/org/xwiki/extension/xar/XarExtensionExtension.java

...i/filter/instance/script/InstanceFilterScriptService.java

...in/java/com/xpn/xwiki/plugin/graphviz/GraphVizPlugin.java

...java/com/xpn/xwiki/plugin/graphviz/GraphVizPluginApi.java

...main/java/com/xpn/xwiki/internal/template/SUExecutor.java

...c/main/java/com/xpn/xwiki/notify/PropertyChangedRule.java

...st/java/com/xpn/xwiki/notify/PropertyChangedRuleTest.java

...ava/org/xwiki/lesscss/compiler/LESSCompilerException.java

...main/java/org/xwiki/localization/LocalizationManager.java

...rc/main/java/org/xwiki/mail/script/ScriptMimeMessage.java

...i-platform-oldcore/src/main/java/com/xpn/xwiki/XWiki.java

...platform-oldcore/src/main/java/com/xpn/xwiki/api/Api.java

...m-oldcore/src/main/java/com/xpn/xwiki/api/Attachment.java