fix: Fix a typo in the README files of ai-statistics plugin

Author: CH3CHO

plugins/wasm-go/extensions/ai-statistics/README.md

@@ -38,7 +38,7 @@ Attribute 配置说明:
 `value_source` 的各种取值含义如下：
 
 - `fixed_value`：固定值
-- `requeset_header` ： attrribute 值通过 http 请求头获取，value 配置为 header key
+- `request_header` ： attrribute 值通过 http 请求头获取，value 配置为 header key
 - `request_body` ：attrribute 值通过请求 body 获取，value 配置格式为 gjson 的 jsonpath
 - `response_header` ：attrribute 值通过 http 响应头获取，value 配置为header key
 - `response_body` ：attrribute 值通过响应 body 获取，value 配置格式为 gjson 的 jsonpath

plugins/wasm-go/extensions/ai-statistics/README_EN.md

@@ -38,7 +38,7 @@ Attribute Configuration instructions:
 The meanings of various values for `value_source` ​​are as follows:
 
 - `fixed_value`: fixed value
-- `requeset_header`: The attrribute is obtained through the http request header
+- `request_header`: The attrribute is obtained through the http request header
 - `request_body`: The attrribute is obtained through the http request body
 - `response_header`: The attrribute is obtained through the http response header
 - `response_body`: The attrribute is obtained through the http response body