They do the same search if you choose support.sas.com in the selector to the left of the search field. A more specific source that is better for this question and many other "(how) does SAS do ..." questions is the Frequently Asked-for Statistics link (known as FASTats) which is available in the Important Links list on the STAT Communities page. See the "Likelihood ratio test for model comparison" item in the FASTats which takes you directly to the place I mentioned.
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