Fix doc for full text search distance operator.

hlinnaka · hlinnaka · commit 1a64c7636f24 · 2020-10-19T17:58:38.000+03:00
Commit 028350f changed its behavior from "at most" to "exactly", but forgot to update the documentation. Backpatch to 9.6. Patch by Justin Pryzby, per Yaroslav Schekin's report. Discussion: https://www.postgresql.org/message-id/20201005191922.GE17626%40telsasoft.com
diff --git a/doc/src/sgml/textsearch.sgml b/doc/src/sgml/textsearch.sgml
@@ -1645,7 +1645,7 @@ SELECT to_tsquery('fat') &lt;-&gt; to_tsquery('cat | rat');
      <listitem>
       <para>
        Returns a query that searches for a match to the first given query
-       followed by a match to the second given query at a distance of at
+       followed by a match to the second given query at a distance of exactly
        <replaceable>distance</replaceable> lexemes, using
        the <literal>&lt;<replaceable>N</replaceable>&gt;</literal>
        <type>tsquery</type> operator.  For example:
