Routing: Fix missing subsection title in EN and CN locales (#833)

docs/config/routing.md

@@ -80,6 +80,8 @@
 当多个属性同时指定时，这些属性需要**同时**满足，才可以使当前规则生效。
 :::
 
+> `domain`: \[string\]
+
 - 纯字符串：同下面的子串，但可以省略前面的 `"keyword:"` 开头。
 - 正则表达式：由 `"regexp:"` 开始，余下部分是一个正则表达式。当此正则表达式匹配目标域名时，该规则生效。例如 "regexp:\\\\.goo.\*\\\\.com\$" 匹配 "www.google.com"、"fonts.googleapis.com"，但不匹配 "google.com"。大小写敏感。
 - 子域名 (推荐)：由 `"domain:"` 开始，余下部分是一个域名。当此域名是目标域名或其子域名时，该规则生效。例如 "domain:xray.com" 匹配 "www.xray.com" 与 "xray.com"，但不匹配 "wxray.com"。

docs/en/config/routing.md

@@ -80,6 +80,8 @@ When a rule points to a load balancer, Xray will select an outbound through this
 When multiple attributes are specified simultaneously, these attributes must be satisfied **simultaneously** for the current rule to take effect.
 :::
 
+> `domain`: \[string\]
+
 - **Pure string**: Same as substring below, but the `"keyword:"` prefix can be omitted.
 - **Regular expression**: Starts with `"regexp:"`, the rest is a regular expression. The rule takes effect when the regular expression matches the target domain. For example, "regexp:\\\\.goo.\*\\\\.com\$" matches "www.google.com" and "fonts.googleapis.com", but not "google.com". Case sensitive.
 - **Subdomain (Recommended)**: Starts with `"domain:"`, the rest is a domain name. The rule takes effect when the domain is the target domain or its subdomain. For example, "domain:xray.com" matches "www.xray.com" and "xray.com", but not "wxray.com".