feat(docs): add further usage for requirements api

Author: Aliorpse

saltify-docs/content/docs-core/command.md

@@ -113,8 +113,8 @@ Requirements 是一个用于指令鉴权的语法，妥当使用可以减少很
 
 ```kotlin
 client.command("stop") {
-    require { user(3650502250, 3521766148) }
-    
+    require { user(3650502250, 3521766148) + group(570335215) }
+
     onExecute {
         @OptIn(DelicateCoroutinesApi::class)
         GlobalScope.launch {
@@ -133,3 +133,7 @@ fun SaltifyCommandRequirementContext.user(vararg targetId: Long) =
         context.event.data.senderId in targetId
     }
 ```
+
+> [!TIP]
+> 
+> 在 require 块内，还可以通过 `or` `and` `not` 拼接 requirements！