docs: streamline UTL_ENCODE usage guide

Author: jiaoshuntian

CN/modules/ROOT/pages/master/oracle_compatibility/utl_encode.adoc

@@ -7,31 +7,6 @@
 
 `UTL_ENCODE` 是 IvorySQL Oracle 兼容模式下的内置包，提供与 Oracle 数据库行为一致的 Base64 编解码功能。它支持将任意二进制数据（`RAW` 类型）转换为可打印的 Base64 ASCII 字节序列，也可以将 Base64 字节序列还原为原始二进制数据。
 
-[NOTE]
-====
-适用版本：IvorySQL（Oracle 兼容模式）
-
-所属扩展：`ivorysql_ora`
-
-包名：`utl_encode`
-====
-
-== 前置条件
-
-. 数据库已安装 `ivorysql_ora` 扩展：
-
-[source,sql]
-----
-CREATE EXTENSION IF NOT EXISTS ivorysql_ora;
-----
-
-. 当前会话处于 Oracle 兼容模式（连接 Oracle 监听端口，或显式设置）：
-
-[source,sql]
-----
-SET ivorysql.compatible_mode = oracle;
-----
-
 == 函数参考
 
 === BASE64_ENCODE

EN/modules/ROOT/pages/master/oracle_compatibility/utl_encode.adoc

@@ -7,31 +7,6 @@
 
 `UTL_ENCODE` is a built-in package available in IvorySQL's Oracle-compatible mode. It provides Base64 encoding and decoding compatible with Oracle Database. The package converts arbitrary binary data (`RAW`) to printable Base64 ASCII bytes and converts Base64 bytes back to their original binary form.
 
-[NOTE]
-====
-Applicable version: IvorySQL in Oracle-compatible mode
-
-Extension: `ivorysql_ora`
-
-Package: `utl_encode`
-====
-
-== Prerequisites
-
-. Install the `ivorysql_ora` extension in the database:
-
-[source,sql]
-----
-CREATE EXTENSION IF NOT EXISTS ivorysql_ora;
-----
-
-. Use Oracle-compatible mode by connecting through the Oracle listener port or setting the mode explicitly:
-
-[source,sql]
-----
-SET ivorysql.compatible_mode = oracle;
-----
-
 == Function reference
 
 === BASE64_ENCODE