fix(docs): update link to preview.ts in usage documentation

[neoandmatrix]

This PR fixes the docs link for the new command asyncapi start preview. The broken link happened as the command files and docs were added in the same PR hence the correct link to command reference in docs can only be added after the command is added by the merging of that PR.

Related issues:-
None

[changeset-bot]

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Latest commit: 4ec3392

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Shurtu-gal]

As far as I am aware this is updated automatically, so your changes will be overwritten.

[neoandmatrix]

Currently the link in docs doesn't work. The one on the asyncapi.com.