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 15bac0dfdad5361a04381c4132cadcddfffc1850..be5ede40d099b32d09e7776f128c1daa3780bf8b 100644 (file)
--- a/doc/src/sgml/textsearch.sgml
+++ b/doc/src/sgml/textsearch.sgml
@@ -1637,7 +1637,7 @@ SELECT to_tsquery('fat') <-> to_tsquery('cat | rat');
      
       
        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
        distance lexemes, using
        the <N>
        tsquery operator.  For example: