Update virusproc-tutorial.md

docs/virusproc-tutorial.md

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 * build_auth.pdb, build_wwpdb.pdb :  file with author-provided BIOMT + coordinates and  file with final BIOMT + coordinates.  These can be inspected/compared in chimera using pointsuite "runchimera.csh" script, or manually by applying Chimera multiscale model/biomt option.  
 * assembly.ncs (X-ray only): these files have pointsuite-calculated NCS.  Useful to compare/check against author-provided NCS, but DO NOT INCLUDE IN PROCESSED ENTRY UNLESS AUTHOR NCS is determined to not be available.  SEE [BELOW](#ncs).  
 
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 ## DEMO EXAMPLES
 
 ### [2XD8 EM virus](https://www.rcsb.org/structure/2XD8)