Modern way to bild syntax diagrams with JSyntrax

[inponomarev]

Overview

Since asciidoctor-diatram 2.2.8, it's possible to build jsyntrax diagrams in more effective way

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Checklist

• [x] Change is covered by automated tests.
• [x] JavaDoc / User Guide is updated.
• [x] CI builds pass.
• [x] PR is tagged.