Eliminate trivial whitespace inconsistency in docs sample code.

doc/src/sgml/rules.sgml

@@ -1002,13 +1002,13 @@ REFRESH MATERIALIZED VIEW sales_summary;
 
 <programlisting>
 CREATE EXTENSION file_fdw;
-CREATE SERVER local_file FOREIGN DATA WRAPPER file_fdw ;
+CREATE SERVER local_file FOREIGN DATA WRAPPER file_fdw;
 CREATE FOREIGN TABLE words (word text NOT NULL)
   SERVER local_file
   OPTIONS (filename '/etc/dictionaries-common/words');
 CREATE MATERIALIZED VIEW wrd AS SELECT * FROM words;
 CREATE UNIQUE INDEX wrd_word ON wrd (word);
-CREATE EXTENSION pg_trgm ;
+CREATE EXTENSION pg_trgm;
 CREATE INDEX wrd_trgm ON wrd USING gist (word gist_trgm_ops);
 VACUUM ANALYZE wrd;
 </programlisting>