keriat zkf 1791 tweak preview ci workflow to allow upon

[keriat]

• fix broken table in documentation
• fix: preview workflow changes allowing to preview incoming pull request

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit e8ab738):

• https://zksync-web-docs--v-refs-pull-262-merge-fgpi23uj.web.app
• https://staging-docs-zksync--v-refs-pull-262-merge-u4gub6pa.web.app

_{(expires Fri, 22 Apr 2022 03:02:34 GMT)}

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[keriat]

:tada: This PR is included in version 2.20.0 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: