doc: Fix incorrectly spelled structname

Commit 61461a300c1 accidentally misspelled the PGcancelConn struct
using the PQ prefix (which admittedly is a very easy typo to make).
Reported off-list.

Reported-by: Alexander Lakhin 

diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index aed45f3428bd3ffaf1ecfff64d8f8cd869d4fbab..101c676e085eb4150b6b075ca2f7e88334903a99 100644 (file)
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -6517,7 +6517,7 @@ int PQcancelSocket(const PGcancelConn *cancelConn);
        A valid descriptor will be greater than or equal to 0;
        a result of -1 indicates that no server connection is currently open.
        This might change as a result of calling any of the functions
-       in this section on the PQcancelConn
+       in this section on the PGcancelConn
        (except for  and
        PQcancelSocket itself).