docs: improve desc for filter field

apps/emqx_authn/i18n/emqx_authn_mongodb_i18n.conf

@@ -34,14 +34,14 @@ emqx_authn_mongodb {
   filter {
     desc {
       en: """
-Statement that is executed during the authentication process.
-Commands can support following wildcards:
+Conditional expression that defines the filter condition in the query.
+Filter supports the following placeholders:
 - <code>${username}</code>: Will be replaced at runtime with <code>Username</code> used by the client when connecting
 - <code>${clientid}</code>: Will be replaced at runtime with <code>Client ID</code> used by the client when connecting
 """
       zh: """
-认证过程中所使用的查询命令。
-查询命令支持如下占位符：
+在查询中定义过滤条件的条件表达式。
+过滤器支持如下占位符：
 - <code>${username}</code>: 将在运行时被替换为客户端连接时使用的用户名
 - <code>${clientid}</code>: 将在运行时被替换为客户端连接时使用的客户端标识符
 """

apps/emqx_authz/i18n/emqx_authz_api_schema_i18n.conf

@@ -122,20 +122,21 @@ emqx_authz_api_schema {
   filter {
     desc {
       en: """
-Statement that is executed during the authorize process.
-Commands can support following wildcards:\n
- - `${username}`: substituted with client's username\n
- - `${clientid}`: substituted with the clientid
+Conditional expression that defines the filter condition in the query.
+Filter supports the following placeholders:
+ - <code>${username}</code>: Will be replaced at runtime with <code>Username</code> used by the client when connecting
+ - <code>${clientid}</code>: Will be replaced at runtime with <code>Client ID</code> used by the client when connecting
 """
       zh: """
-鉴权过程中所使用的查询命令。
-查询命令支持如下占位符：
-- `${username}`: 代替客户端的用户名
-- `${clientid}`: 代替客户端的客户端标识符"""
+在查询中定义过滤条件的条件表达式。
+过滤器支持如下占位符：
+- <code>${username}</code>: 将在运行时被替换为客户端连接时使用的用户名
+- <code>${clientid}</code>: 将在运行时被替换为客户端连接时使用的客户端标识符
+"""
     }
     label {
-      en: """filter"""
-      zh: """filter"""
+      en: """Filter"""
+      zh: """过滤器"""
     }
   }
 

apps/emqx_authz/i18n/emqx_authz_schema_i18n.conf

@@ -269,20 +269,21 @@ and the new rules will override all rules from the old config file.
   filter {
     desc {
       en: """
-Statement that is executed during the authorize process.
-Commands can support following wildcards:\n
- - `${username}`: substituted with client's username\n
- - `${clientid}`: substituted with the clientid
+Conditional expression that defines the filter condition in the query.
+Filter supports the following placeholders:
+ - <code>${username}</code>: Will be replaced at runtime with <code>Username</code> used by the client when connecting
+ - <code>${clientid}</code>: Will be replaced at runtime with <code>Client ID</code> used by the client when connecting
 """
       zh: """
-鉴权过程中所使用的查询命令。
-查询命令支持如下占位符：
-- `${username}`: 代替客户端的用户名
-- `${clientid}`: 代替客户端的客户端标识符"""
+在查询中定义过滤条件的条件表达式。
+过滤器支持如下占位符：
+- <code>${username}</code>: 将在运行时被替换为客户端连接时使用的用户名
+- <code>${clientid}</code>: 将在运行时被替换为客户端连接时使用的客户端标识符
+"""
     }
     label {
-      en: """filter"""
-      zh: """filter"""
+      en: """Filter"""
+      zh: """过滤器"""
     }
   }