manpage: fix user-data-dir example path
manpage: fix user-data-dir example path

The fact that we have this weird vestigal "Default" directory
is really confusing.  :(

Review URL: http://codereview.chromium.org/3014028

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@53828 0039d316-1c4b-4281-b951-d872f2087c98

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