fix: update bdd explanation

[msvticket]

Description

Update explanation on how the e2e tests for jx are happening.

Checklist:

• I have mentioned the appropriate type(scope), as referenced here in the commit message and PR title for the semantic checks to pass.
• I have signed off the commit, as per instructions mentioned here.
• Any dependent changes have already been merged.
• Add link from maintainer section.

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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

[jenkins-x-bot]

⭐ PR built and available in a preview jenkins-x-jx-docs-pr-3755 here