Automatic update from web-platform-tests
Add references for CSS2/sec5
Some CSS2/sec5 tests were missing references. This adds in references for the remaining sec5 tests without references except for first-letter-000.xht.
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Add in references for css/CSS2/selector tests
All CSS2/selector tests were missing references. This change adds in references for these tests.
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wpt-commits: 2eb1f3a046ffccef07c831897f262fbcc31ec8e8, 69e5802277ed34ad99092743b4313ab8eec7323e
wpt-pr: 16061