WebStyle: goto regression test fixes

* Improves goto_engine related regression tests to take into account
  recent modification to the Atlantis Demo site, in particular
  with respect to restriction and file formats.
  (closes #1293)

Signed-off-by: Samuele Kaplun <samuele.kaplun@cern.ch>
1: D400 First line should end with '.', not 'd'
1: D205 Blank line missing between one-line summary and description
20: I101 copyright is missing
30: D400 First line should end with '.', not ','
30: D205 Blank line missing between one-line summary and description