Bug 1656913 [wpt PR 24857] - [infrastructure] Fix comment on reftest_match-print-ref.html, a=testonly

Automatic update from web-platform-tests
[infrastructure] Fix comment on reftest_match-print-ref.html

See https://github.com/web-platform-tests/wpt/issues/23918

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wpt-commits: ca53f8039c011f146922e569854124d21275aa35
wpt-pr: 24857

testing/web-platform/tests/infrastructure/reftest/reftest_match-print-ref.html

@@ -2,7 +2,7 @@
 <meta name="reftest-pages" content="1-2">
 <style>
 * {margin: 0; padding:0}
-/* It is unclear to me why this is 180px rather than 192px (2 inches at 96dpi) */
+/* This should be 192px (2 inches at 96dpi), but the default margin on body reduces it to 180px */
 div {height:180px;}
 </style>
 <div>