doc: adjust libpq wording to be neither/nor

bmomjian · bmomjian · commit f4daf8958219 · 2019-04-11T13:25:33.000-04:00
Reported-by: postgresql@cohi.at Discussion: https://postgr.es/m/155419437926.737.10876947446993402227@wrigleys.postgresql.org Backpatch-through: 9.4
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
@@ -3578,7 +3578,7 @@ char *PQescapeLiteral(PGconn *conn, const char *str, size_t length);
      </tip>
 
      <para>
-      Note that it is not necessary nor correct to do escaping when a data
+      Note that it is neither necessary nor correct to do escaping when a data
       value is passed as a separate parameter in <function>PQexecParams</> or
       its sibling routines.
      </para>
