update syntax for Images/Media files in MediaWiki

The preferred syntax for Images and other media is [[File:Foo.jpg]] in MediaWiki since v1.14 (2008).  [[Image:Foo.jpg]] is deprecated but still works as an alias to the File namespace.  I don't think this would break any existing wikis since talk of switching the syntax/namespace for images started back in 2002 (https://phabricator.wikimedia.org/T2044).  NS_FILE became the new namespace for Files in v 1.14 in late 2008. (https://www.mediawiki.org/wiki/Release_notes/1.14)  There is still a namespace alias so '[[Image:]]' still works today.  It's just that MediaWiki supports other media as well, and so the name and syntax used in documentation (see https://www.mediawiki.org/wiki/Help:Images) has long been '[[File:foo.jpg]]'

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