Fix several broken $PostgreSQL$ keywords. Noted while experimenting

with Magnus's script to remove these.

doc/src/sgml/ref/reindexdb.sgml

 <!--
-$PostgreSQL $
+$PostgreSQL: pgsql/doc/src/sgml/ref/reindexdb.sgml,v 1.11 2010/09/19 16:17:45 tgl Exp $
 PostgreSQL documentation
 -->
 

src/include/port/svr4.h

-/* $PostgreSQL */
+/* $PostgreSQL: pgsql/src/include/port/svr4.h,v 1.15 2010/09/19 16:17:45 tgl Exp $ */
 
 /* nothing needed */

src/interfaces/ecpg/preproc/nls.mk

-# $PostgreSQL $
+# $PostgreSQL: pgsql/src/interfaces/ecpg/preproc/nls.mk,v 1.7 2010/09/19 16:17:45 tgl Exp $
 CATALOG_NAME	 = ecpg
 AVAIL_LANGUAGES	 = de es fr it ja pt_BR tr zh_CN
 GETTEXT_FILES	 = descriptor.c ecpg.c pgc.c preproc.c type.c variable.c