The is no actual page for sa-learn. So if you do a search for sa-learn and click the Titles button you get this page. You need to do a search and click Text. Or you could just click the link below. 
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Thought the \["BayesInSpamAssassin"\] page is probably what you are looking for. |
Look at
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*\["BayesInSpamAssassin"\]
*\[http://wiki.apache.org/spamassassin/FixingErrors?action=fullsearch&context=180&value=sa-learn&fullsearch=Text Search for sa-learn\] |