[plsql] using_index_clause should use index_properties instead of index_attributes

[Dysprosium0626]

According to Oracle latest SQL Language Reference, using_index_clause for constraint is illustrated as following:
using_index_clause：

index_properties：

However, in PlSqlParser.g4,using_index_clause:

grammars-v4/sql/plsql/PlSqlParser.g4

Lines 4927 to 4929 in 7f917ad

	using_index_clause
	: USING INDEX (index_name | '(' create_index ')' | index_attributes)?
	;

Actually it should be modified to:

using_index_clause
    : USING INDEX (index_name | '(' create_index ')' | index_properties)
    ;

[teverett]

@Dysprosium0626 thanks