[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2462: remove bare asserts for segment out-of-range errors in mutable retrieve

[Tahoe-LAFS]

#2462: remove bare asserts for segment out-of-range errors in mutable retrieve
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     Reporter:  daira    |      Owner:  daira
         Type:  defect   |     Status:  assigned
     Priority:  normal   |  Milestone:  1.11.0
    Component:  code-    |    Version:  1.10.1
  mutable                |   Keywords:  cleanup error mutable retrieve
   Resolution:           |  download
Launchpad Bug:           |
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Comment (by daira):

 The exception raised should be as documented in `interfaces.py`, per
 #2461.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2462#comment:2>
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