Add missing semicolons in documentation examples

Author: Daniel Gustafsson <daniel@yesql.se>

doc/src/sgml/ddl.sgml

@@ -3097,14 +3097,14 @@ CREATE TABLE measurement (
 
 <programlisting>
 CREATE TABLE measurement_y2006m02 PARTITION OF measurement
-    FOR VALUES FROM ('2006-02-01') TO ('2006-03-01')
+    FOR VALUES FROM ('2006-02-01') TO ('2006-03-01');
 
 CREATE TABLE measurement_y2006m03 PARTITION OF measurement
-    FOR VALUES FROM ('2006-03-01') TO ('2006-04-01')
+    FOR VALUES FROM ('2006-03-01') TO ('2006-04-01');
 
 ...
 CREATE TABLE measurement_y2007m11 PARTITION OF measurement
-    FOR VALUES FROM ('2007-11-01') TO ('2007-12-01')
+    FOR VALUES FROM ('2007-11-01') TO ('2007-12-01');
 
 CREATE TABLE measurement_y2007m12 PARTITION OF measurement
     FOR VALUES FROM ('2007-12-01') TO ('2008-01-01')