Issue 932 - improve docs about JSONScript

[gesinn-it-ilm]

This PR is related to the issue #932.

This PR contains:

• updated the documentation for JSONScript usage in SRF
• ensured consistency with the improvements made in SMW
• added script to update the list of test cases for JSONScript tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.39%. Comparing base (b3e10e4) to head (6d16fca).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #933   +/-   ##
=========================================
  Coverage     45.39%   45.39%           
  Complexity     2326     2326           
=========================================
  Files            80       80           
  Lines          9078     9078           
=========================================
  Hits           4121     4121           
  Misses         4957     4957           

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