doc: update query section to show LIMIT/OFFSET like SELECT

The parameter names were slightly better in SELECT, so make them match.

Reported-by: Euler Taveira

Discussion: https://postgr.es/m/CAHE3wgh-EYuAbLG1VS3QTHii1TgWS31h-fYEgrdda7oTOuskOQ@mail.gmail.com

Backpatch-through: master

Author: bmomjian

doc/src/sgml/queries.sgml

@@ -1912,7 +1912,8 @@ SELECT a + b AS sum, c FROM table1 ORDER BY sum + c;          -- wrong
 SELECT <replaceable>select_list</replaceable>
     FROM <replaceable>table_expression</replaceable>
     <optional> ORDER BY ... </optional>
-    <optional> LIMIT { <replaceable>number</replaceable> | ALL } </optional> <optional> OFFSET <replaceable>number</replaceable> </optional>
+    <optional> LIMIT { <replaceable class="parameter">count</replaceable> | ALL } </optional>
+    <optional> OFFSET <replaceable class="parameter">start</replaceable> </optional>
 </synopsis>
   </para>