docs(fgs): add notes for some parameters of the function resource

docs/resources/fgs_function.md

@@ -264,6 +264,10 @@ The following arguments are supported:
 * `app_agency` - (Optional, String) Specifies the execution agency enables you to obtain a token or an AK/SK for
   accessing other cloud services.
 
+  -> After using this parameter, the function execution agency (`app_agency`) and the function configuration
+     agency (`agency`) can be independently set, which can reduce unnecessary performance loss. Otherwise, the same
+     agency is used for both function execution and function configuration.
+
 * `description` - (Optional, String) Specifies the description of the function.
 
 * `initializer_handler` - (Optional, String) Specifies the initializer of the function.
@@ -327,7 +331,8 @@ The following arguments are supported:
 * `concurrency_num` - (Optional, Int) Specifies the number of concurrent requests of the function.
   The valid value ranges from `1` to `1,000`, the default value is `1`.
 
-  -> This parameter is only supported by the `v2` version of the function.
+  -> 1. This parameter is only supported by the `v2` version of the function.
+     <br>2. This parameter is available only when the `runtime` parameter is set to **http** or **Custom Image**.
 
 * `gpu_memory` - (Optional, Int) Specifies the GPU memory size allocated to the function, in MByte (MB).
   The valid value ranges form `1,024` to `16,384`, the value must be a multiple of `1,024`.