[MERGE][Bugs #327421, #3274245] Improve shelf documentation, fix backtrace

[Daniel Watkins]

Hello all,

The attached has a few small fixes to shelf.  There are a couple of
documentation fixes, as per bugs #327421 and #3274245.  There is also a
fix for the backtrace that would appear in the case that you call ``bzr
unshelve not-an-integer``.


Dan
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