Update the doc of lang#pascal layer

docs/cn/layers/lang/pascal.md

@@ -11,13 +11,14 @@ lang: zh
 - [模块简介](#模块简介)
 - [启用模块](#启用模块)
 - [快捷键](#快捷键)
-  - [运行当前脚本](#运行当前脚本)
 
 <!-- vim-markdown-toc -->
 
 ## 模块简介
 
-这一模块为在 SpaceVim 中进行 pascal 开发提供了支持。
+这一模块为在 SpaceVim 中进行 pascal 开发提供了支持。默认使用
+[free pascal](https://www.freepascal.org/) 作为编译器，在使用
+这一模块之前，需要下载并安装编译器。
 
 ## 启用模块
 
@@ -30,6 +31,4 @@ lang: zh
 
 ## 快捷键
 
-### 运行当前脚本
-
 在编辑 pascal 文件时，可通过快捷键 `SPC l r` 快速异步运行当前文件，运行结果会展示在一个独立的执行窗口内。

docs/layers/lang/pascal.md

@@ -9,14 +9,15 @@ description: "This layer is for pascal development, provides syntax highlighting
 
 - [Description](#description)
 - [Install](#install)
-- [Features](#features)
 - [Key bindings](#key-bindings)
 
 <!-- vim-markdown-toc -->
 
 ## Description
 
-This layer is for pascal development.
+This layer is for pascal development. And the default compiler
+is [free pascal](https://www.freepascal.org/), You need to download
+the compiler before using this layer.
 
 ## Install
 
@@ -26,10 +27,8 @@ To use this configuration layer, update custom configuration file with:
 [[layers]]
   name = "lang#pascal"
 ```
-## Features
-
-- code runner
 
 ## Key bindings
 
-To running a pascal file, you can press `SPC l r` to run current file without loss focus, and the result will be shown in a runner buffer.
+Make sure you have `fpc` in your PATH. The key binding `SPC l r` will run
+`fpc` command asynchronously. and the result will be shown in a runner buffer.