Readme Formatting & Link

examples/fodo_space_charge/README.rst

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 .. _examples-fodo-envelope-sc:
 
 FODO Cell with 2D Space Charge using Envelope Tracking
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 This example illustrates a 0.5 A proton beam with a kinetic energy of 6.7 MeV in a FODO cell,
 with 2D space charge included.  The parameters are those described in:
 
-R.D. Ryne et al, "A Test Suite of Space-Charge Problems for Code Benchmarking,"
+R.D. Ryne et al, `"A Test Suite of Space-Charge Problems for Code Benchmarking," <https://accelconf.web.cern.ch/e04/PAPERS/WEPLT047.PDF>`__
 in Proc. EPAC 2004, Lucerne, Switzerland:  KV Beam in a FODO Channel
 
 The purpose of this example is to illustrate the use of envelope tracking mode with 2D space charge.