scanvi user guide and fix bullets

[PierreBoyeau]

Fixes #1170

[codecov]

Codecov Report

Merging #1193 (62347b1) into master (e336e09) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1193   +/-   ##
=======================================
  Coverage   90.74%   90.74%           
=======================================
  Files          95       95           
  Lines        7668     7668           
=======================================
  Hits         6958     6958           
  Misses        710      710           

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