docs(web): update optscript.rst (in progress)

[masatake]

I will use this area for improving docs/optscript.rst incrementally. Though it is not ready for review, however, if you are interested in writing or improve an optlib parser with optscript, you can read the changes pushed here as a text. I will update the text frequently.

[codecov[bot]]

Codecov Report

Base: 82.84% // Head: 82.84% // No change to project coverage :thumbsup:

Coverage data is based on head (eedee15) compared to base (50e7a74). Patch has no changes to coverable lines.

:exclamation: Current head eedee15 differs from pull request most recent head 3b9df16. Consider uploading reports for the commit 3b9df16 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2997   +/-   ##
=======================================
  Coverage   82.84%   82.84%           
=======================================
  Files         223      223           
  Lines       54279    54279           
=======================================
  Hits        44965    44965           
  Misses       9314     9314           

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