#395 Fix previewer source URL

[sandeep-ps]

Description

This PR fixes a URL in the previewer documentation page.
Fixes: #395

Review Time Estimate

• Immediately
• Within one week
• When possible

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the CHANGELOG.md.
• I have signed the CLA
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[CLAassistant]

All committers have signed the CLA.

[sandeep-ps]

It looks like the build failures are unrelated to the changes in this PR. Could someone please restart the build when they get a chance? Thanks.