Comment 2 for bug 1825256

TITLE: The Manage -> Export page radio buttons alignment need to be better

BUG SUMMARY: Currently the export/index.php page has some radio buttons + description text but spacing is all wrong as the first description is closer to second radio button than the first
Adjust the export page radio button layout
So the text aligns better with radio button and that discription is paired better with radio button
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Commit hash: e49ff0183c07c185729226dd145b666002293fd2
Environment tested: Master
Browser tested: Chrome
Theme used: Primary school

PRECONDITIONS:
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1) SIte admin exists

TEST STEPS:
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1) log in as site admin
2) Browse to the Export page (Main menu -> Manage -> Export)
3) Verify that the spacing between the radio button with label "Standalone HTML website" and the help text below is smaller ✔

Catalyst QA Approved ✔