psql latex fixes

Remove extra line at bottom of table for new 'latex' mode border=3.
Also update 'latex'-longtable 'tableattr' docs to say
'whitespace-separated' instead of 'space'.

doc/src/sgml/ref/psql-ref.sgml

@@ -2163,7 +2163,7 @@ lo_import 152801
           <para>
           In <literal>latex-longtable</literal> format, this controls
           the proportional width of each column containing a left-aligned
-          data type.  It is specified as a space-separated list of values,
+          data type.  It is specified as a whitespace-separated list of values,
           e.g. <literal>'0.2 0.2 0.6'</>.  Unspecified output columns
           use the last specified value.
           </para>

src/bin/psql/print.c

@@ -1681,7 +1681,7 @@ print_latex_text(const printTableContent *cont, FILE *fout)
 	{
 		printTableFooter *footers = footers_with_default(cont);
 
-		if (opt_border >= 2)
+		if (opt_border == 2)
 			fputs("\\hline\n", fout);
 
 		fputs("\\end{tabular}\n\n\\noindent ", fout);