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 ca1e72dd89c294fd053672555fa4438e2e33a2bc..7e0b7e44f14fce8af1a4b3121bf7c0eccef6cb7c 100644 (file)
--- a/doc/src/sgml/textsearch.sgml
+++ b/doc/src/sgml/textsearch.sgml
@@ -1563,7 +1563,7 @@ 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</>&gt;</literal>
        <type>tsquery</> operator.  For example: