Fix doc for full text search distance operator.

Commit 028350f619 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
index 2ebdf02bfaf072d3c699f750464d7739e7e363ec..8af6ac01d302f1a654a195ce5536113a425df519 100644 (file)
--- a/doc/src/sgml/textsearch.sgml
+++ b/doc/src/sgml/textsearch.sgml
@@ -1645,7 +1645,7 @@ SELECT to_tsquery('fat') <-> 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: