Fix markdown blockquote excessive spacing

[codyrancher]

Summary

Things have improved slightly since the issue was filed but the margins were a bit excessive. I'll attach a screenshot of what we have in master and what we have in his pr. If we're happy with master I'll just close the issue.

Fixes #11854

Occurred changes and/or fixed issues

Updated margins

Technical notes summary

The blockquote is only styled in one location so it's not too hard to verify. You just need to find the appropriate charts.

Areas or cases that should be tested

• Navigate to Cluster Explorer → Apps → Charts → Kasten
• Verify blockquote is positioned closer to the left edge and higher vertically

Areas which could experience regressions

Same as above

Screenshot/Video

Master:

PR:

Checklist

• The PR is linked to an issue and the linked issue has a Milestone, or no issue is needed
• The PR has a Milestone
• The PR template has been filled out
• The PR has been self reviewed
• The PR has a reviewer assigned
• The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
• The PR has reviewed with UX and tested in light and dark mode, or there are no UX changes
• The PR has been reviewed in terms of Accessibility
• The PR has considered, and if applicable tested with, the three Global Roles Admin, Standard User and User Base

[aalves08]

LGTM