[Swift-user] multipage user guide

[Ben Clifford]

The user guide is now available in one-page-per-section format which some 
people regard as easier to view online than the existing 
one-page-for-whole-guide format.

Both one-page-per-section and one-page-for-whole-guide formats are 
linked from the documentation webpage at 
http://www.ci.uchicago.edu/swift/docs/ and both are generated from the 
same docbook source so should have the same content always.

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