Merge pull request #2975 from vespa-engine/vekterli/fuzzy-matching-is…

…-now-optimized

Document that fuzzy search implementation is optimized

en/reference/query-language-reference.html

@@ -455,9 +455,10 @@ <h2 id="where">where</h2>
       <p>Find an example in <a href="../text-matching.html#fuzzy-match">text matching</a>.</p>
       {% include important.html content="Only string <a href='schema-reference.html#attribute'>attribute</a>
       fields in <a href='services-content.html#document'>documents</a> are supported (single, array or weightedset).
-      It is also not optimized, but setting <a href='#prefixlength'>prefixLength</a> greater than 0
-      would narrow the match for the <a href='schema-reference.html#attribute'>fast-search</a>,
-      so it won't run a full scan."%}
+      Matching is optimized internally when <code>maxEditDistance</code> is 1 or 2.
+      Setting <a href='#prefixlength'>prefixLength</a> greater than 0
+      narrows the match for the <a href='schema-reference.html#attribute'>fast-search</a>,
+      greatly reducing the number of terms that must be considered."%}
     </td>
   </tr>
   <tr>