doc: Small style improvements

doc/src/sgml/pageinspect.sgml

@@ -321,7 +321,7 @@ test=# SELECT * FROM brin_metapage_info(get_raw_page('brinidx', 0));
       identifiers in a <acronym>BRIN</acronym> index range map page.
       For example:
 <screen>
-test=# SELECT * FROM brin_revmap_data(get_raw_page('brinidx', 2)) limit 5;
+test=# SELECT * FROM brin_revmap_data(get_raw_page('brinidx', 2)) LIMIT 5;
   pages  
 ---------
  (6,137)
@@ -433,7 +433,7 @@ test=# SELECT * FROM gin_page_opaque_info(get_raw_page('gin_index', 2));
       <function>gin_leafpage_items</function> returns information about
       the data stored in a <acronym>GIN</acronym> leaf page.  For example:
 <screen>
-test=# SELECT first_tid, nbytes, tids[0:5] as some_tids
+test=# SELECT first_tid, nbytes, tids[0:5] AS some_tids
         FROM gin_leafpage_items(get_raw_page('gin_test_idx', 2));
  first_tid | nbytes |                        some_tids
 -----------+--------+----------------------------------------------------------