doc: Fix XML formatting that psql cannot handle

Breaking <phrase> over two lines is not handled by psql's
create_help.pl.  (It creates faulty \help output.)

Undo the formatting change introduced by
9bdad1b515 to fix this for now.

doc/src/sgml/ref/fetch.sgml

@@ -29,8 +29,7 @@ PostgreSQL documentation
 <synopsis>
 FETCH [ <replaceable class="parameter">direction</replaceable> ] [ FROM | IN ] <replaceable class="parameter">cursor_name</replaceable>
 
-<phrase>where <replaceable class="parameter">direction</replaceable> can
-be one of:</phrase>
+<phrase>where <replaceable class="parameter">direction</replaceable> can be one of:</phrase>
 
     NEXT
     PRIOR

doc/src/sgml/ref/move.sgml

@@ -29,8 +29,7 @@ PostgreSQL documentation
 <synopsis>
 MOVE [ <replaceable class="parameter">direction</replaceable> ] [ FROM | IN ] <replaceable class="parameter">cursor_name</replaceable>
 
-<phrase>where <replaceable class="parameter">direction</replaceable> can
-be one of:</phrase>
+<phrase>where <replaceable class="parameter">direction</replaceable> can be one of:</phrase>
 
     NEXT
     PRIOR