[HACKERS] [PATCH][Documination] Add optional USING keyword before opclass name in INSERT statemet

[Nikolay Shaplov]

If I read gram.y code for insert statement, I see that there is an optional 
USING keyword before opclass name


opt_class:  any_name                                { $$ = $1; }
            | USING any_name                        { $$ = $2; }
            | /*EMPTY*/                             { $$ = NIL; }
        ;

but it the documentation this keyword is omitted.

I'd like to offer a patch that fixes this problem 

-- 
Nikolay Shaplov
Postgres Professional: http://www.postgrespro.com
Russian Postgres Company
diff --git a/doc/src/sgml/ref/create_index.sgml b/doc/src/sgml/ref/create_index.sgml
index 7dee405..788bc3f 100644
--- a/doc/src/sgml/ref/create_index.sgml
+++ b/doc/src/sgml/ref/create_index.sgml
@@ -22,7 +22,7 @@ PostgreSQL documentation
  <refsynopsisdiv>
 <synopsis>
 CREATE [ UNIQUE ] INDEX [ CONCURRENTLY ] [ [ IF NOT EXISTS ] <replaceable class="parameter">name</replaceable> ] ON <replaceable class="parameter">table_name</replaceable> [ USING <replaceable class="parameter">method</replaceable> ]
-    ( { <replaceable class="parameter">column_name</replaceable> | ( <replaceable class="parameter">expression</replaceable> ) } [ COLLATE <replaceable class="parameter">collation</replaceable> ] [ <replaceable class="parameter">opclass</replaceable> ] [ ASC | DESC ] [ NULLS { FIRST | LAST } ] [, ...] )
+    ( { <replaceable class="parameter">column_name</replaceable> | ( <replaceable class="parameter">expression</replaceable> ) } [ COLLATE <replaceable class="parameter">collation</replaceable> ] [ [ USING ] <replaceable class="parameter">opclass</replaceable> ] [ ASC | DESC ] [ NULLS { FIRST | LAST } ] [, ...] )
     [ WITH ( <replaceable class="PARAMETER">storage_parameter</replaceable> = <replaceable class="PARAMETER">value</replaceable> [, ... ] ) ]
     [ TABLESPACE <replaceable class="parameter">tablespace_name</replaceable> ]
     [ WHERE <replaceable class="parameter">predicate</replaceable> ]

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