Extension History page should not be publicly available by default

Extension History page:  https://www.xwiki.org/xwiki/bin/view/XWiki/ExtensionHistory is publicly accessible, while the documentation mentions that only an administrator can keep track of extensions that are installed/uninstalled on his wiki.

See documentation:  https://extensions.xwiki.org/xwiki/bin/view/Extension/Extension%20Manager%20Application#HExtensionHistory